#include<stdio.h>
#include<string.h>
struct wordData{
    char world[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 date;
    scanf("%s",data.word);
    scanf(" %c",&data.letter);
    int result = countOccurrence(data);
    if(result == 0)
    {
        printf("-1");
    }
    else{
        printf("%d",result);
    }
    return 0;
}