import java.util.*;
import java.util.zip.*;
import java.util.List;
import java.util.regex.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import java.util.concurrent.locks.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.table.*;
import java.io.*;
import java.net.*;
import java.lang.reflect.*;
import java.lang.ref.*;
import java.lang.management.*;
import java.security.*;
import java.security.spec.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.math.*;
public class main {


public static void main(String[] args) throws Exception {
  assertEquals(1, ocr_glyphCount("{symbol}"));
  assertEquals(2, ocr_glyphCount("ab"));
  assertEquals(1, ocr_glyphCount("[ab]"));
  assertEquals(2, ocr_glyphCount("[ab] c"));
  assertEquals("[a]", ocr_unescape("\\[a\\]"));
}

static <A> A assertEquals(Object x, A y) {
  return assertEquals(null, x, y);
}

static <A> A assertEquals(String msg, Object x, A y) {
  if (!(x == null ? y == null : x.equals(y)))
    throw fail((msg != null ? msg + ": " : "") + x + " != " + y);
  return y;
}
static int ocr_glyphCount(String s) {
  return l(ocr_parseGlyphs(dropSpaces(s)));
}
static String ocr_unescape(String s) {
  StringBuilder buf = new StringBuilder();
  for (int i = 0; i < l(s); i++) {
    if (s.charAt(i) == '\\' && i+1 < l(s)) { // parse escaped character
      ++i;
    }
    buf.append(s.charAt(i));
  }
  return str(buf);
}


static String str(Object o) {
  return String.valueOf(o);
}
  static RuntimeException fail() {
    throw new RuntimeException("fail");
  }
  
  static RuntimeException fail(Object msg) {
    throw new RuntimeException(String.valueOf(msg));
  }
  
  static RuntimeException fail(String msg) {
    throw new RuntimeException(unnull(msg));
  }
   
  static RuntimeException fail(String msg, Throwable innerException) {
    throw new RuntimeException(msg, innerException);
  }
  
  // disabled for now to shorten some programs 
  /*static RuntimeException fail(S msg, O... args) {
    throw new RuntimeException(format(msg, args));
  }*/
static List<String> ocr_parseGlyphs(String s) {
  List<String> l = new ArrayList<String>();
  for (int i = 0; i < l(s); i++)
    if (s.charAt(i) == '\\' && i+1 < l(s)) { // parse escaped character
      l.add(substring(s, i, i+2));
      ++i;
    } else if (s.charAt(i) == '[') { // parse group
      int j = i+1;
      StringBuilder buf = new StringBuilder();
      while (j < l(s) && s.charAt(j) != ']') {
        if (s.charAt(j) == '\\' && j+1 < l(s))
          buf.append(s.charAt(j++));
        buf.append(s.charAt(j++));
      }
      l.add(str(buf));
      i = j;
    } else if (s.charAt(i) == '{') { // parse symbol
      int j = i;
      StringBuilder buf = new StringBuilder();
      while (j < l(s) && s.charAt(j) != '}') {
        if (s.charAt(j) == '\\' && j+1 < l(s))
          buf.append(s.charAt(j++));
        buf.append(s.charAt(j++));
      }
      buf.append(s.charAt(j));
      l.add(str(buf));
      i = j;
    } else
      l.add(substring(s, i, i+1));
  return l;
}
static int l(Object[] a) { return a == null ? 0 : a.length; }
static int l(boolean[] a) { return a == null ? 0 : a.length; }
static int l(byte[] a) { return a == null ? 0 : a.length; }
static int l(int[] a) { return a == null ? 0 : a.length; }
static int l(float[] a) { return a == null ? 0 : a.length; }
static int l(char[] a) { return a == null ? 0 : a.length; }
static int l(Collection c) { return c == null ? 0 : c.size(); }
static int l(Map m) { return m == null ? 0 : m.size(); }
static int l(CharSequence s) { return s == null ? 0 : s.length(); } 

static int l(Object o) {
  return o instanceof String ? l((String) o)
    : l((Collection) o); // incomplete
}

static String dropSpaces(String s) {
  return unnull(s).replace(" ", "");
}


static String unnull(String s) {
  return s == null ? "" : s;
}

static <A> List<A> unnull(List<A> l) {
  return l == null ? emptyList() : l;
}

static <A> Iterable<A> unnull(Iterable<A> i) {
  return i == null ? emptyList() : i;
}

static Object[] unnull(Object[] a) {
  return a == null ? new Object[0] : a;
}

static BitSet unnull(BitSet b) {
  return b == null ? new BitSet() : b;
}
static String substring(String s, int x) {
  return safeSubstring(s, x);
}

static String substring(String s, int x, int y) {
  return safeSubstring(s, x, y);
}


// hopefully covers all cases :)
static String safeSubstring(String s, int x, int y) {
  if (s == null) return null;
  if (x < 0) x = 0;
  if (x > s.length()) return "";
  if (y < x) y = x;
  if (y > s.length()) y = s.length();
  return s.substring(x, y);
}

static String safeSubstring(String s, int x) {
  return safeSubstring(s, x, l(s));
}

static List emptyList() {
  return new ArrayList();
  //ret Collections.emptyList();
}

}