mitooni ino ham test koni ....
while(scanf("%d%d",&n, &a)!=EOF){
baraye khorooj az while false ya hamoon 0 lazeme ....
va agar na hich vaght az while kharej nemishi o TL mishe ...
scanf age movafagh be khoondan beshe tedade oon Variable i ke khoonde ro bar migardoone age na EOF ... dar har soorat != 0 yani True bar migardoone ....
farghesh ine ke intori age movafagh be khoondan nashe EOF !=2 yani false baes mishe ta abad too loop gir nakone ....
mamnoon ACC shod.
vali man baz ham motevajeh nemisham ke chera TL mishod.farghe in ba scanf e khali chie.