s = input()

count = 0
sw_no = True
sw_m = False
sw_i = False
sw_n = False

for i in range(len(s)):
    if sw_no:
        if s[i] == "m":
            sw_no = False
            sw_m = True
    elif sw_m:
        if s[i] == "i":
            sw_m = False
            sw_n = True
    elif sw_n:
        if s[i] != "-" and s[i] != "n":
            sw_no = True
            sw_n = False
        elif s[i] == "n":
            count += 1
            sw_no = True
            sw_n = False
        
print(count)