Amin Rasulzada is a second year student of SITE, ADA University who prepares for DSA midterm this Sunday. All problems are done, and he decided to prepare a Riddle for classmates. so he starts his story....

OnCe uPoN A TiMe, AmIn - aN ADA UnIvErSiTy sTuDeNt, WaS WoRkInG On a cOdInG PrOjEcT WhEn hE AcCiDeNtAlLy 
SpIlLeD CoFfEe aLl oVeR HiS LaPtOp. PaNiCkEd, He rUsHeD To tHe iT DePaRtMeNt fOr hElP. tO HiS SuRpRiSe, 
ThE It sTaFf wAs aBlE To rEcOvEr aLl oF HiS DaTa aNd fIx tHe lApToP, sAvInG HiS PrOjEcT FrOm dIsAsTeR. 
GrAtEfUl fOr tHeIr hElP, aMiN MaDe sUrE To bAcK Up hIs wOrK ReGuLaRlY FrOm tHeN On.

Professor sees this unusual text and decides is it ok or no acording to some unexpected algorithm in his brain. You must find out the algorithm and solve Amin's riddle.

For help Amin presents you a hint: ADA as a single word always contains only capital letters.

Input

Text with Latin letters, spaces, symbols '.' and ','.

Output

Print Yes or No.