/in/foo.cc: In function 'int main()':
/in/foo.cc:19:6: warning: unused variable 'now' [-Wunused-variable]
  int now=-1,k1,k12,now2=-1;
      ^~~
/in/foo.cc:19:16: warning: unused variable 'k12' [-Wunused-variable]
  int now=-1,k1,k12,now2=-1;
                ^~~
/in/foo.cc:28:53: warning: 'k1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   else if(a[i]>='A'&&a[i]<='Z') cout<<b[(a[i]-'A'+27+k1)%26+27];
                                         ~~~~~~~~~~~~^~~~