Codeforces A. Petya and Strings Solution

Solve in C:

#include<stdio.h>
#include<string.h>
int main()
{

    char s[101],t[101];
    int r;
    while(scanf("%s%s",s,t)!=EOF)
    {
        r=strcmp(strlwr(s),strlwr(t));
        printf("%d\n",r);
    }

}