altrlz

a = list(input())

count = 0

for value in a:
	if value == "1":
		count += 1
		
print(count)

altrlz

import random

RANK, SUIT = 0, 1
#デッキを作る
def make_deck():
	rank = range(1,14)
	suit = ('S','H','C','D')
	deck = [(i,j) for i in rank for j in suit]
	random.shuffle(deck)
	return deck