file = open('24_11465.txt')
A = file.readline()
A = A[:-2]
A = A.replace('A', '0')
A = A.replace('B', '0')
A = A.replace('C', '0')
A = A.replace('8', '1')
A = A.replace('9', '1')
Max = 0
for i in range(1, len(A)):
    count = 0
    if int(A[i]) != int(A[i-1]):
        count += 1
        Max = max(Max, count)
print(Max)