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#include<iostream>
#include<string>
 
using namespace std;
 
int main()
{
	string s1, s2;
 
	cin >> s1 >> s2;
 
	string s1 = "Alice";
	string s2 = "Bob";
 
	cout << s1 << ' ' << s2 << '\n';
 
	return 0;
 
}

prog.cpp: In function ‘int main()’:
prog.cpp:12:9: error: redeclaration of ‘std::__cxx11::string s1’
  string s1 = "Alice";
         ^~
prog.cpp:8:9: note: ‘std::__cxx11::string s1’ previously declared here
  string s1, s2;
         ^~
prog.cpp:13:9: error: redeclaration of ‘std::__cxx11::string s2’
  string s2 = "Bob";
         ^~
prog.cpp:8:13: note: ‘std::__cxx11::string s2’ previously declared here
  string s1, s2;
             ^~

Standard output is empty