S = input().lstrip('ｗ')
Ss = S.split('ｗ')

Ss.pop()

max_w = 0
ans = []

for i in range(len(Ss)):
    if Ss[i] == '':
        continue
    else:
        tmp = 0
        for j in range(i + 1, len(Ss)):
            if Ss[j] != '':
                break
            tmp += 1
        if tmp == max_w:
            ans.append(Ss[i])
        elif tmp > max_w:
            max_w = tmp
            ans = []
            ans.append(Ss[i])

print(*ans, sep='\n')