I'm a Pascal writer. I can't solve B then I go read the solution of problem B in FPC and saw about 6 A/C by the same code:↵
https://codeforces.com/contest/1730/submission/173489911↵
https://codeforces.com/contest/1730/submission/173487790↵
https://codeforces.com/contest/1730/submission/173487187 ↵
https://codeforces.com/contest/1730/submission/173486665↵
https://codeforces.com/contest/1730/submission/173482185↵
https://codeforces.com/contest/1730/submission/173454097
https://codeforces.com/contest/1730/submission/173489911↵
https://codeforces.com/contest/1730/submission/173487790↵
https://codeforces.com/contest/1730/submission/173487187 ↵
https://codeforces.com/contest/1730/submission/173486665↵
https://codeforces.com/contest/1730/submission/173482185↵
https://codeforces.com/contest/1730/submission/173454097