how fix this error

import java.util.*;

import java.lang.*;

import java.io.*;

import java.lang.Math;

publicclass Main {

publicstaticint leftrightString(String S) {

//this is default OUT

int result =0;

//write Logic here:

int i,j;

int count =0;

for(i =0; i < N; i++){

for(j =0; j < N; j++){

if(A[i] == A[j] && i != j)

break;

}

if(j == N ){

count++;

}

}

result = count ;

return result;

}

}

publicstaticvoid main(String args[])

{

Scanner sc=new Scanner(System.in);

//INPUT [uncomment & modify if required]

String S = sc.next();

//OUTPUT [uncomment & modify if required]

System.out.println(leftrightString(S));

}

}