一眼看明白

#include <iostream>
using namespace std;
int main(){
char n;
cin>>n;
if(n=='a'){cout <<"A";}
else if(n=='b'){cout <<"B";}
else if(n=='c'){cout <<"C";}
else if(n=='d'){cout <<"D";}
else if(n=='e'){cout <<"E";}
else if(n=='f'){cout <<"F";}
else if(n=='g'){cout <<"G";}
else if(n=='h'){cout <<"H";}
else if(n=='i'){cout <<"I";}
else if(n=='j'){cout <<"J";}
else if(n=='k'){cout <<"K";}
else if(n=='l'){cout <<"L";}
else if(n=='m'){cout <<"M";}
else if(n=='n'){cout <<"N";}
else if(n=='o'){cout <<"O";}
else if(n=='p'){cout <<"P";}
else if(n=='q'){cout <<"Q";}
else if(n=='r'){cout <<"R";}
else if(n=='s'){cout <<"S";}
else if(n=='t'){cout <<"T";}
else if(n=='u'){cout <<"U";}
else if(n=='v'){cout <<"V";}
else if(n=='w'){cout <<"W";}
else if(n=='x'){cout <<"X";}
else if(n=='y'){cout <<"Y";}
else if(n=='z'){cout <<"Z";}
else if(n=='A'){cout <<"a";}
else if(n=='B'){cout <<"b";}
else if(n=='C'){cout <<"c";}
else if(n=='D'){cout <<"d";}
else if(n=='E'){cout <<"e";}
else if(n=='F'){cout <<"f";}
else if(n=='G'){cout <<"g";}
else if(n=='H'){cout <<"h";}
else if(n=='I'){cout <<"i";}
else if(n=='J'){cout <<"j";}
else if(n=='K'){cout <<"k";}
else if(n=='L'){cout <<"l";}
else if(n=='M'){cout <<"m";}
else if(n=='N'){cout <<"n";}
else if(n=='O'){cout <<"o";}
else if(n=='P'){cout <<"p";}
else if(n=='Q'){cout <<"q";}
else if(n=='R'){cout <<"r";}
else if(n=='S'){cout <<"s";}
else if(n=='T'){cout <<"t";}
else if(n=='U'){cout <<"u";}
else if(n=='V'){cout <<"v";}
else if(n=='W'){cout <<"w";}
else if(n=='X'){cout <<"x";}
else if(n=='Y'){cout <<"y";}
else if(n=='Z'){cout <<"z";}
return 0;
}