public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  String S = sc . next ( ) ;
  long [ ] [ ] dp = new long [ S . length ( ) + 1 ] [ 4 ] ;
  long prime = 1000000007 ;
  dp [ 0 ] [ 0 ] = 1 ;
  for ( int i = 1 ;
  i <= S . length ( ) ;
  i ++ ) {
    for ( int j = 0 ;
    j < 4 ;
    j ++ ) {
      dp [ i ] [ j ] = dp [ i - 1 ] [ j ] ;
      dp [ i ] [ j ] %= prime ;
    }
    if ( S . charAt ( i - 1 ) == 'A' ) {
      dp [ i ] [ 1 ] += dp [ i - 1 ] [ 0 ] ;
      dp [ i ] [ 1 ] %= prime ;
    }
    else if ( S . charAt ( i - 1 ) == 'B' ) {
      dp [ i ] [ 2 ] += dp [ i - 1 ] [ 1 ] ;
      dp [ i ] [ 2 ] %= prime ;
    }
    else if ( S . charAt ( i - 1 ) == 'C' ) {
      dp [ i ] [ 3 ] += dp [ i - 1 ] [ 2 ] ;
      dp [ i ] [ 3 ] %= prime ;
    }
    else {
      for ( int j = 0 ;
      j < 4 ;
      j ++ ) {
        dp [ i ] [ j ] += 2 * dp [ i - 1 ] [ j ] ;
        dp [ i ] [ j ] %= prime ;
      }
      dp [ i ] [ 1 ] += dp [ i - 1 ] [ 0 ] ;
      dp [ i ] [ 2 ] += dp [ i - 1 ] [ 1 ] ;
      dp [ i ] [ 3 ] += dp [ i - 1 ] [ 2 ] ;
      dp [ i ] [ 1 ] %= prime ;
      dp [ i ] [ 2 ] %= prime ;
      dp [ i ] [ 3 ] %= prime ;
    }
  }
  out . println ( dp [ S . length ( ) ] [ 3 ] ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; String S = sc . next ( ) ; long [ ] [ ] dp = new long [ S . length ( ) + 1 ] [ 4 ] ; long prime = 1000000007 ; dp [ 0 ] [ 0 ] = 1 ; for ( int i = 1 ; i <= S . length ( ) ; i ++ ) { for ( int j = 0 ; j < 4 ; j ++ ) { dp [ i ] [ j ] = dp [ i - 1 ] [ j ] ; dp [ i ] [ j ] %= prime ; } if ( S . charAt ( i - 1 ) == ' A ' ) { dp [ i ] [ 1 ] += dp [ i - 1 ] [ 0 ] ; dp [ i ] [ 1 ] %= prime ; } else if ( S . charAt ( i - 1 ) == ' B ' ) { dp [ i ] [ 2 ] += dp [ i - 1 ] [ 1 ] ; dp [ i ] [ 2 ] %= prime ; } else if ( S . charAt ( i - 1 ) == ' C ' ) { dp [ i ] [ 3 ] += dp [ i - 1 ] [ 2 ] ; dp [ i ] [ 3 ] %= prime ; } else { for ( int j = 0 ; j < 4 ; j ++ ) { dp [ i ] [ j ] += 2 * dp [ i - 1 ] [ j ] ; dp [ i ] [ j ] %= prime ; } dp [ i ] [ 1 ] += dp [ i - 1 ] [ 0 ] ; dp [ i ] [ 2 ] += dp [ i - 1 ] [ 1 ] ; dp [ i ] [ 3 ] += dp [ i - 1 ] [ 2 ] ; dp [ i ] [ 1 ] %= prime ; dp [ i ] [ 2 ] %= prime ; dp [ i ] [ 3 ] %= prime ; } } out . println ( dp [ S . length ( ) ] [ 3 ] ) ; }
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