// editor1
#include<stdio.h>
#include<string.h>
struct WordData
{
    char word[101];
    char letter;
};
int count0currence(stryct 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 WordDara data;
    scanf("%s ",data.word);
    scanf(" %c",data.letter);
    int result = count0currence(data);
    if(result==0)
    {
        printf("-1");
    }
    e;se
    {
        printf("d",result)''
    }
    return 0;
}