#include <iostream>

#define N 100

const char* strstr (const char* src, const char* target);

int main(void)
{
    char src[N];
    char target[N];

    std::cin >> src;
    std::cin >> target;

    const char* x = strstr (src, target);
    if (x == NULL)
        std::cout << -1;
    else
        std::cout << (int)(x-src);
    return 0;
}

const char* strstr (const char* src, const char* target)
{
    int target_len = 0;
    for ( int i = 0; target[i] != 0; i++ )
        target_len += 1;

    int k = 0;

    for (int i = 0; src[i] != '\0'; i++) {
        if (src[i] == target[0]) {
            for (int j = 0; target[j] != '\0'; j++) {
                if (src[i+j] == target[j])
                    k++;
                if (k == target_len)
                    return &src[i];
            }
        }
        k = 0;
    }
    return NULL;
}