import re
s=re.sub('^ｗ+','',input())
l=re.split(r'([^ｗ]+ｗ+)',s)
a=[x.count('ｗ') for x in l]
if max(a)<1: print('')
else:
	for i in [n for n, x in enumerate(a) if x==max(a)]:
		print(l[i].replace('ｗ',''))