c-gcc, 57 bytes

Result

WA

Duration

531ms

Code [DL]

main(i,s){for(;i<26;i++)putchar((getchar()+i-12)%26+65);}

stdin

ASBWBUSKRRQRXZHGZPZPLDVUTL

stdout

CVFBHBATBCCELOXXRITKHATTT

stderr

/tmp/code.c:1:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main(i,s){for(;i<26;i++)putchar((getchar()+i-12)%26+65);}
 ^~~~
/tmp/code.c: In function 'main':
/tmp/code.c:1:1: warning: type of 'i' defaults to 'int' [-Wimplicit-int]
/tmp/code.c:1:1: warning: type of 's' defaults to 'int' [-Wimplicit-int]
/tmp/code.c:1:25: warning: implicit declaration of function 'putchar' [-Wimplicit-function-declaration]
 main(i,s){for(;i<26;i++)putchar((getchar()+i-12)%26+65);}
                         ^~~~~~~
/tmp/code.c:1:34: warning: implicit declaration of function 'getchar' [-Wimplicit-function-declaration]
 main(i,s){for(;i<26;i++)putchar((getchar()+i-12)%26+65);}
                                  ^~~~~~~

strace