file = open('1.txt')
A = file.readline()
l = 0
ans = 0
k = 0
for r in range(len(A)):
    if A[r] in 'LISENOK':
        k += 1
    while k >= 1:
        if A[l] in 'LISENOK':
            k -= 1
        l += 1
    ans = max(ans, r - l + 1)
print(ans)