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.
l = input()
t = 0
for c in l:
    if c == '1': t+=1
print(c)
l = input()
t = 0
for c in l:
    if c == '1': t+=1
print(t)