public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( new BufferedInputStream ( System . in ) ) ;
  n = sc . nextInt ( ) ;
  m = sc . nextInt ( ) ;
  c = sc . next ( ) . charAt ( 0 ) ;
  s = new char [ n ] [ m ] ;
  cnt = new int [ n ] [ m ] ;
  String string ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    string = sc . next ( ) ;
    for ( int j = 0 ;
    j <= string . length ( ) - 1 ;
    j ++ ) {
      s [ i ] [ j ] = string . charAt ( j ) ;
    }
  }
  sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < m ;
    j ++ ) {
      if ( s [ i ] [ j ] == c ) {
        dfs ( i , j ) ;
      }
    }
  }
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( new BufferedInputStream ( System . in ) ) ; n = sc . nextInt ( ) ; m = sc . nextInt ( ) ; c = sc . next ( ) . charAt ( 0 ) ; s = new char [ n ] [ m ] ; cnt = new int [ n ] [ m ] ; String string ; for ( int i = 0 ; i < n ; i ++ ) { string = sc . next ( ) ; for ( int j = 0 ; j <= string . length ( ) - 1 ; j ++ ) { s [ i ] [ j ] = string . charAt ( j ) ; } } sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < m ; j ++ ) { if ( s [ i ] [ j ] == c ) { dfs ( i , j ) ; } } } System . out . println ( sum ) ; }
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