foo.c:1:18: warning: extra tokens at end of #include directive [enabled by default]
 #include<stdio.h>;
                  ^
foo.c:2:19: warning: extra tokens at end of #include directive [enabled by default]
 #include<stdlib.h>;
                   ^
foo.c: In function 'main':
foo.c:12:16: error: invalid suffix "c" on integer constant
 if ((a[0]+b[0]-2c[n-1])%26==0)
                ^
foo.c:15:27: error: expected ')' before 'b'
 else if ((a[0] + c[0] - 2 b[n - 1]) % 26 == 0)
                           ^