Polycarp come new game play he call a miss bigramA bigram word sequence adjacent letter itFor example word abbaaba contain bigrams ab bb ba aa ab baThe game go follow First Polycarp come word consist lowercase letter b then write bigrams whiteboard order appear word after wipe whiteboardfinally Polycarp invite guess word come wasyour goal find word possible write bigrams remove result sequence bigrams Polycarp end withthe test generate way answer exist if multiple answer print