/in/foo.cc: In function 'int main()':
/in/foo.cc:31:47: warning: 'key2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(a[i]>='a'&&a[i]<='z') cout<<b[(a[i]-'a'+1+key)%26+1];
                                    ~~~~~~~~~~~^~~~~