https://www.acmicpc.net/problem/11022
import 'dart:io';
void main(){
int? t=int.parse(stdin.readLineSync()!);
for(var i=1;i<=t;i++){
String? st=stdin.readLineSync();
final v=st!.split(' ').map<int>((o)=>int.parse(o));
var a=v.elementAt(0);
var b=v.elementAt(1);
print("Case #${i}: ${a} + ${b} = ${a+b}");
}
}