import sys
import math

def getUni(s):
	st = ""
	for c in "123456789":
		if(s.find(c)!=-1):
			st += c
	return st

inputs = []
unique=[]
counter=0
line = True
while line:
	line = sys.stdin.readline()
	if line=="\n":
		break
	i = line.replace("\n","").replace(" ","")
	it = getUni(i)
print(len(unique))