#include<stdio.h>
#include<string.h>
struct word {
    char str[100];
    char ch;
};int count0ccurrences(struct word w) {
    int count = 0;
    for(int i = 0; i < strlen(w.str)); i++){
       if(w.str[i] == w.ch)
        int count++;
    }
    if(count == 0)
    return -1;
    else 
    return count;
}
int main(){
    struct word w;
    scanf("%s", w.str);
    scanf(" %c", &w.ch);
    int result = count0ccurrences(w);
    printf("%d", result);
    return 0;
}