#include<stdio.h>
#include<string.h>
struct WordData{
    char word[101];
    char letter;
};
int countOccurence(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 == )
    {
        printf("-1");
    }else{
        printf("%d",result);
    }
    return 0;
}