#include<stdio.h>
#include<string.h>
struct word {
    char str[100];
    char ch;
}; int count0currences(struct word W) {
    int count = 0;
    for(int i = 0; i < strlen(w.str); i++) {
        if(w.str[i] == w.ch)
        count++;
    }
    if(count == 0)
    return -1;
    else
    return count;
}
int main() {
    struct word w;
    scanf("%s", w.str);
    scanf(" %c", &w.ch);
    int result = count0occurances(w);
    printf("%d", result);
    return 0;
}