import           Control.Monad
import           Control.Monad.ST
import qualified Data.Array                    as A
import qualified Data.Array.Unboxed            as AU
import qualified Data.ByteString.Char8         as BS
import           Data.Char
import           Data.Int
import qualified Data.IntMap                   as IM
import qualified Data.Map                      as M
import           Data.List
import qualified Data.Set                      as S
import           Data.Maybe
import           Data.Ord
import           Data.Time
import qualified Data.Vector                   as V
import qualified Data.Vector.Mutable           as VM
import qualified Data.Vector.Unboxed           as VU
import qualified Data.Vector.Unboxed.Mutable   as VUM

readString = map BS.unpack . BS.words <$> BS.getLine
readStrings n = replicateM n $ BS.unpack <$> BS.getLine
toPair [x, y] = (x, y)

main = do
  nums <- map read . words <$> getLine
  putStrLn $ solve nums

solve :: [Int] -> String
solve nums | length (group $ sort nums) == 2 = "Yes"
           | otherwise                       = "No"
