#!/usr/bin/env python3

import sys

occ=[{} for _ in range(8)]
for line in sys.stdin:
	for i in range(8):
		occ[i][line[i]]=occ[i].get(line[i],0)+1

for d in occ:
	mincount=1e300
	minat=None
	for k in d:
		if d[k]<mincount:
			mincount=d[k]
			minat=k
	print(minat,end="")

print()