static int subsequence ( int [ ] S , int [ ] T , int n , int m ) {
  int [ ] [ ] dp = new int [ n + 1 ] [ m + 1 ] ;
  int mod = 1000000007 ;
  for ( int i = 0 ;
  i <= n ;
  i ++ ) dp [ i ] [ 0 ] = 1 ;
  for ( int j = 0 ;
  j <= m ;
  j ++ ) dp [ 0 ] [ j ] = 1 ;
  for ( int i = 1 ;
  i <= n ;
  ++ i ) {
    for ( int j = 1 ;
    j <= m ;
    ++ j ) {
      dp [ i ] [ j ] = dp [ i - 1 ] [ j ] + dp [ i ] [ j - 1 ] - dp [ i - 1 ] [ j - 1 ] ;
      if ( S [ i - 1 ] == T [ j - 1 ] ) dp [ i ] [ j ] += dp [ i - 1 ] [ j - 1 ] ;
      dp [ i ] [ j ] += mod ;
      dp [ i ] [ j ] %= mod ;
    }
  }
  return dp [ n ] [ m ] ;
}

static int subsequence ( int [ ] S , int [ ] T , int n , int m ) { int [ ] [ ] dp = new int [ n + 1 ] [ m + 1 ] ; int mod = 1000000007 ; for ( int i = 0 ; i <= n ; i ++ ) dp [ i ] [ 0 ] = 1 ; for ( int j = 0 ; j <= m ; j ++ ) dp [ 0 ] [ j ] = 1 ; for ( int i = 1 ; i <= n ; ++ i ) { for ( int j = 1 ; j <= m ; ++ j ) { dp [ i ] [ j ] = dp [ i - 1 ] [ j ] + dp [ i ] [ j - 1 ] - dp [ i - 1 ] [ j - 1 ] ; if ( S [ i - 1 ] == T [ j - 1 ] ) dp [ i ] [ j ] += dp [ i - 1 ] [ j - 1 ] ; dp [ i ] [ j ] += mod ; dp [ i ] [ j ] %= mod ; } } return dp [ n ] [ m ] ; }
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