Snuke has a grid consisting of three squares numbered 1, 2 and 3. In each square, either `0` or `1` is written. The number written in Square i is s_i.  Snuke will place a marble on each square that says `1`. Find the number of squares on which Snuke will place a marble.
s = input()
counter = 0

for i in range(0,3):
    if s[i] == '1':
        counter +=1

print("'1' が"+str(counter)+"個含まれています。")
s = input()
counter = 0

for i in range(0,3):
    if s[i] == '1':
        counter +=1

print(str(counter))