import sys, math

s = [int(i) for i in input().split()]

s2 = []
for i in range(len(s)-1):
    last = s[i]
    if s[i+1] != 0:
        s2.append(s[i])
if len(s) != 0:
    s2.append(s[-1])
for i in range(len(s2)):
    print(s2[i], end=' ')