#include <stdio.h>
int main(){
    char str[1000];
    char cg;
    int count = 0;
    scanf("%s", str);
    scanf(" %c", &ch);
    for(int i = 0; str[i] != '\0'; i++){
        if(str[i] == ch){
            count++;
        }
    }
    if(count == 0){
        printf(" -1");
    }
    else{
        printf("%d",count);
    }
    return 0;
}