#Code Written by : John Nixon
#Date: 14:09:2022  Time: 22:39:59
#Copyrights are applicable

import sys
import os
sys.setrecursionlimit(10000)
try:
    sys.stdin = open('./input.txt', 'r')
    sys.stdout = open('./output.txt', 'w')
except:
    pass

def distinct_years(sentence):
    different_years = set()
    str2 = ""
    for char in sentence:
        if char.isdigit():
            str2 += char

        if char == "-":
            str2 = ""

        if len(str2) == 4:
            different_years.add(str2)
            str2 = ""

    return len(different_years)


string = input()

print(distinct_years(string))