public static void main ( String [ ] args ) {
  FastReader input = new FastReader ( ) ;
  PrintWriter pw = new PrintWriter ( System . out ) ;
  int n = input . nextInt ( ) ;
  int m = input . nextInt ( ) ;
  int pairs = m + ( n - 1 ) ;
  pw . println ( pairs ) ;
  for ( int i = 1 ;
  i <= m ;
  i ++ ) {
    pw . println ( 1 + " " + i ) ;
  }
  for ( int i = 2 ;
  i <= n ;
  i ++ ) {
    pw . println ( i + " " + 1 ) ;
  }
  pw . flush ( ) ;
  pw . close ( ) ;
}

public static void main ( String [ ] args ) { FastReader input = new FastReader ( ) ; PrintWriter pw = new PrintWriter ( System . out ) ; int n = input . nextInt ( ) ; int m = input . nextInt ( ) ; int pairs = m + ( n - 1 ) ; pw . println ( pairs ) ; for ( int i = 1 ; i <= m ; i ++ ) { pw . println ( 1 + " ▁ " + i ) ; } for ( int i = 2 ; i <= n ; i ++ ) { pw . println ( i + " ▁ " + 1 ) ; } pw . flush ( ) ; pw . close ( ) ; }
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