#include <stdio.h>
#include <string.h>

int countOccurrences(char str[], char ch) {
    int count = 0;
    for (int i = 0; str[i] != '\0'; i++) {
        if (str[i] == ch) {
            count++;
        }
    }
    return count;
}

int main() {
    char str[101], ch;

    scanf("%s", str);
   
    scanf(" %c", &ch);

    int result = countOccurrences(str, ch);

    if (result == 0)
        printf("-1\n");
    else
        printf("%d\n", result);

 return 0;
}