def firstOccurrence(s, x):
    n = len(s)
    m = len(x)
    if m > n:
        return -1
    for i in range(n - m + 1):
        match = True
        for j in range(m):
            if x[j] != '*' and s[i + j] != x[j]:
                match = False
                break
        if match:
            return i
    return -1