f = open('24-1.txt')
s = f.readline()
differense = 0
previousNumber = 0
for i in range(1, len(s)-1):
    if s[i] < s[i-1] and s[i] < s[i+1]:
        if previousNumber != 0:
            if i - previousNumber > differense:
                differense = i - previousNumber
        previousNumber = i
print(differense)