rows = [list(input()) for w in range(5) ]
i=0
string = ""
longest_list = max(rows,key=len)
lenL = len(longest_list)
while i<lenL:
for row in rows:
lenR = len(row)
if lenR > i :
string+=row[i]
i+=1
print(string)
cm93cyA9IFtsaXN0KGlucHV0KCkpIGZvciB3IGluIHJhbmdlKDUpIF0KCmk9MApzdHJpbmcgPSAiIgpsb25nZXN0X2xpc3QgPSBtYXgocm93cyxrZXk9bGVuKQpsZW5MID0gbGVuKGxvbmdlc3RfbGlzdCkKd2hpbGUgaTxsZW5MOgoJZm9yIHJvdyBpbiByb3dzOgoJCWxlblIgPSBsZW4ocm93KQoJCWlmIGxlblIgPiBpIDoKCQkJc3RyaW5nKz1yb3dbaV0KCWkrPTEKcHJpbnQoc3RyaW5nKQ==