#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;
			}
		}
	}
}
/**************************************************************
	Problem: 1848
	User: admin
	Language: C
	Result: Accepted
	Time:66 ms
	Memory:1144 kb
****************************************************************/