import re

S = input()
ans = []
max_w = 0
pos = 0
for m in re.finditer('ｗ+', S):
    nw = len(m.group())
    part = S[pos:m.start()]
    if m.start() == 0:
        pass
    elif nw > max_w:
        max_w = nw
        ans = [part]
    elif nw == max_w:
        ans.append(part)
    pos = m.end()

for s in ans:
    print(s)