public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  char [ ] arr = sc . next ( ) . toCharArray ( ) ;
  int a1 = - 1 ;
  int a2 = - 1 ;
  for ( char c : arr ) {
    if ( c >= '0' && c <= '9' ) {
      if ( a1 == - 1 ) {
        a1 = c - '0' ;
      }
      else {
        a2 = c - '0' ;
      }
    }
  }
  int ans ;
  if ( a2 == - 1 ) {
    ans = a1 ;
  }
  else {
    ans = a1 * 10 + a2 ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; char [ ] arr = sc . next ( ) . toCharArray ( ) ; int a1 = - 1 ; int a2 = - 1 ; for ( char c : arr ) { if ( c >= '0' && c <= '9' ) { if ( a1 == - 1 ) { a1 = c - '0' ; } else { a2 = c - '0' ; } } } int ans ; if ( a2 == - 1 ) { ans = a1 ; } else { ans = a1 * 10 + a2 ; } System . out . println ( ans ) ; }
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