static int lastKDigits ( int a [ ] , int n , int k ) {
  int num = ( int ) ( Math . pow ( 10 , k ) ) ;
  int mul = a [ 0 ] % num ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    a [ i ] = a [ i ] % num ;
    mul = ( a [ i ] * mul ) % num ;
  }
  return mul ;
}

static int lastKDigits ( int a [ ] , int n , int k ) { int num = ( int ) ( Math . pow ( 10 , k ) ) ; int mul = a [ 0 ] % num ; for ( int i = 1 ; i < n ; i ++ ) { a [ i ] = a [ i ] % num ; mul = ( a [ i ] * mul ) % num ; } return mul ; }
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