public static void main ( String [ ] args ) {
  Map < String , Deque < String >> deq = new HashMap < > ( ) ;
  String [ ] participants = new String [ ] {
    "a" , "b" , "c" };
    for ( int i = 0 ;
    i < 3 ;
    i ++ ) {
      String s = sc . next ( ) ;
      deq . put ( participants [ i ] , new ArrayDeque < > ( ) ) ;
      for ( int j = 0 ;
      j < s . length ( ) ;
      j ++ ) {
        deq . get ( participants [ i ] ) . addLast ( s . charAt ( j ) + "" ) ;
      }
    }
    String prev = participants [ 0 ] ;
    while ( true ) {
      if ( deq . get ( prev ) . size ( ) == 0 ) {
        System . out . println ( prev . toUpperCase ( ) ) ;
        return ;
      }
      prev = deq . get ( prev ) . pollFirst ( ) ;
    }
  }
  
public static void main ( String [ ] args ) { Map < String , Deque < String > > deq = new HashMap < > ( ) ; String [ ] participants = new String [ ] { " a " , " b " , " c " } ; for ( int i = 0 ; i < 3 ; i ++ ) { String s = sc . next ( ) ; deq . put ( participants [ i ] , new ArrayDeque < > ( ) ) ; for ( int j = 0 ; j < s . length ( ) ; j ++ ) { deq . get ( participants [ i ] ) . addLast ( s . charAt ( j ) + " " ) ; } } String prev = participants [ 0 ] ; while ( true ) { if ( deq . get ( prev ) . size ( ) == 0 ) { System . out . println ( prev . toUpperCase ( ) ) ; return ; } prev = deq . get ( prev ) . pollFirst ( ) ; } }
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