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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String str="this is Rayani";
        String s;
        int count=0;
        for(i=0;i<str.length;i++)
        {
         if(str[i]!=" " && str[i+1]!=" ")
         {
          s=s.concat(str[i]);
          if(str[i]='t')
          count++;
          }
          else
          {
          System.out.println(s-count);
          s=" ";
          count=0;
          }
         }
	}
}

Main.java:15: error: cannot find symbol
        for(i=0;i<str.length;i++)
            ^
  symbol:   variable i
  location: class Ideone
Main.java:15: error: cannot find symbol
        for(i=0;i<str.length;i++)
                ^
  symbol:   variable i
  location: class Ideone
Main.java:15: error: cannot find symbol
        for(i=0;i<str.length;i++)
                     ^
  symbol:   variable length
  location: variable str of type String
Main.java:15: error: cannot find symbol
        for(i=0;i<str.length;i++)
                             ^
  symbol:   variable i
  location: class Ideone
Main.java:17: error: cannot find symbol
         if(str[i]!=" " && str[i+1]!=" ")
                ^
  symbol:   variable i
  location: class Ideone
Main.java:17: error: array required, but String found
         if(str[i]!=" " && str[i+1]!=" ")
               ^
Main.java:17: error: cannot find symbol
         if(str[i]!=" " && str[i+1]!=" ")
                               ^
  symbol:   variable i
  location: class Ideone
Main.java:17: error: array required, but String found
         if(str[i]!=" " && str[i+1]!=" ")
                              ^
Main.java:19: error: cannot find symbol
          s=s.concat(str[i]);
                         ^
  symbol:   variable i
  location: class Ideone
Main.java:19: error: array required, but String found
          s=s.concat(str[i]);
                        ^
Main.java:20: error: cannot find symbol
          if(str[i]='t')
                 ^
  symbol:   variable i
  location: class Ideone
Main.java:20: error: array required, but String found
          if(str[i]='t')
                ^
Main.java:25: error: bad operand types for binary operator '-'
          System.out.println(s-count);
                              ^
  first type:  String
  second type: int
13 errors

Standard output is empty