#include<stdio.h>
#include<string.h>
{
    struct WordData {
        char word[101];
        char letter;
    };
    int countOccurrence(struct WordData w) {
        int count  = 0;
        for(int i=0;i<strlen(w.word); i++)
        {
            if(w.word[i] == w.letter) {
                count++;
            }
        }
        return count;
    }
    int main()
    {
        struct WordData data;
        scanf("%s",data.word);
        scanf(" %c",&data.letter);
        int result = countOccurrence(data);
        if(result == 0)
        {
            printf("-1");
        }
        else
        }
        printf("%d",result);
        }
         return 0;
}
}