import java.awt.*;
import java.io.*;

import java.awt.event.*;

public class wordComp{

	
	public static void main(String args[]){
	int viga = 0;
	int i = 0;
	BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
	String son1 = new String();
	String son2 = new String();
	try {
		System.out.println("Sisesta esimene sõna");
		son1 = in.readLine();
		System.out.println("Sisesta teine sõna");
		son2 = in.readLine();
	} catch (Exception e){}
	if (son1.equals(son2)){
		System.out.println("Sõnad on identsed");
	} else {
		for (i=0; i<son1.length(); i++){
			if (!son1.substring(i,i+1).equals(son2.substring(i,i+1))){
				viga++;
			}		
		}	
		System.out.println(viga);
		if (viga==1) {
			System.out.println("Sõnad erinevad 1 tähe poolest");
		}
	}
	


	}
}