C :

#include<stdio.h>
#include<string.h>
int main() {
	char s1[100],s2[100];
	scanf("%s%s",&s1,&s2);
	int len1 = strlen(s1);
	int len2 = strlen(s2);
	if(len1 == len2) {
		for(int i=0; i<len1; i++) {
			if(s1[i] == s2[i]) {
				printf("0");
				return 0;
			}
		}
	} else if(len1<len2) {
		for(int i=0; i<len1; i++) {
			if(s1[i] != s2[i]) {
				printf("%d",s1[i]-s2[i]);
				return 0;
			}
		}
	} else if(len1>len2) {
		for(int i=0; i<len2; i++) {
			if(s1[i] != s2[i]) {
				printf("%d",s1[i]-s2[i]);
				return 0;
			}
		}
	}
}

C++ :

#include<bits/stdc++.h>
using namespace std;
int main()
{
	string s ,s1,s2;
	getline(cin,s);
    int p;
    p = s.find(' ');
	s1 = s.substr(0,p);
	//cout<<s1<<endl; 
    s2 = s.substr(p+1,s.size()-1-p);
    //cout<<s2<<endl;
	if(s1 == s2){
		cout<<"0";
	}else{
		for(int i = 0;i < 100;i++){
			if(s1[i] != s2[i]){
				cout << s1[i] -s2[i];
				break;
			}
		}
	}
 	return 0;
}

Java :

import java.util.Scanner;

public class Main {
    public static void main(String arg[]){
    Scanner in=new Scanner(System.in);
    String s=in.nextLine();
    String sz[]=s.split("\\s+");
        System.out.println(sz[0].compareTo(sz[1]));

    }
}