S = input()
cnt = 0
n = 0
for i in S:
    if n == 0 and i == 'm':
        n += 1
    elif n == 1 and i == 'i':
        n += 1
    elif n == 2 and i == '-':
        continue
    elif n == 2 and i == 'n':
        cnt += 1
        n = 0
    else:
        n = 0
print(cnt)