static long findSum ( String L , String R ) {
  long a , b , l , r , ret ;
  a = modulo ( L ) ;
  b = modulo ( R ) ;
  l = ( ( a * ( a - 1 ) ) % mod * inv2 ) % mod ;
  r = ( ( b * ( b + 1 ) ) % mod * inv2 ) % mod ;
  ret = ( r % mod - l % mod ) ;
  if ( ret < 0 ) ret = ret + mod ;
  else ret = ret % mod ;
  return ret ;
}

static long findSum ( String L , String R ) { long a , b , l , r , ret ; a = modulo ( L ) ; b = modulo ( R ) ; l = ( ( a * ( a - 1 ) ) % mod * inv2 ) % mod ; r = ( ( b * ( b + 1 ) ) % mod * inv2 ) % mod ; ret = ( r % mod - l % mod ) ; if ( ret < 0 ) ret = ret + mod ; else ret = ret % mod ; return ret ; }
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