import sys
lines = sys.stdin.readlines()
first = [i for i, s in enumerate(lines) if len(s.strip()) > 0][0]
lines = lines[first:]
min_ltrim = min((len(s)-len(s.lstrip()) for s in lines))
min_rtrim = min((len(s)-len(s.rstrip()) for s in lines))
print "\n".join((s[min_ltrim:-min_rtrim] for s in lines))