S = input().strip()
T = input().strip()

m = len(T)
n = len(S)

if m == 1:
    if T in S:
        print(-1)
    else:
        print(0)
else:
    # Find all occurrences of T in S
    occurrences = []
    t_len = len(T)
    for i in range(len(S) - t_len + 1):
        if S[i:i+t_len] == T:
            occurrences.append(i)
    
    if not occurrences:
        print(0)
    else:
        # Generate intervals [i, i + m - 2]
        intervals = []
        for i in occurrences:
            end = i + m - 2
            intervals.append((i, end))
        
        # Sort intervals by their end
        intervals.sort(key=lambda x: x[1])
        
        # Greedy interval covering
        count = 0
        last = -1
        for start, end in intervals:
            if start > last:
                count += 1
                last = end
        
        print(count)