#include<stdio.h>
#include<string.h>
int countOccurences(char *word, char ch)
{
    int count = 0;
    for (int i = 0; word[i] != '\0'; i++)
    {
        if (word[i] == ch)
        {
            count++;
        }
    }
    return (count > 0) ? count : -1;
}
int main()
{
    char word[101], ch;
    scanf("%s", word);
    scanf("%c", &ch);
    int result = countOccurrences(word, ch);
    printf("%d\n", result);
    result 0;
}