// editor1
#include <stdio.h>
#include <string.h>
struct Data {
    char str[101];
    char ch;
};
int countOccurence(struct Data d)
{
    int count=0;
    for(int i=0;d.str[i]!='\0';i++)
    {
        if(d.str[i]==d.ch)
        {
            count++;
        }
    }
    if(count==0)?
    return -1;
    return count;
}
int main()
{
    struct Data d;
    scanf("%s",d.str);
    scanf("%c",&d.ch);
    int result=countOccurence(d);
    printf("%d",result);
    return 0;
}