Educational Codeforces Round 34 E Swapping Characters
ESwappingCharactersWehadastringsconsistingofnlowercaseLatinletters.Wemadekcopiesofthisstring,thusobtainingkidenticalstringss1, s2, …, sk.Afterthat,ineachofthesestringsweswappedexactlytwocharacters(the