include

include

using namespace std;

int main() { // Complete the program string a,b; cin>>a; cin>>b; string c=a+b; int len1 = a.size(); int len2 = b.size(); cout<< len1 << " " << len2 <

include

include

using namespace std;

int main() { // Complete the program string a,b; cin>>a; cin>>b; string c=a+b; int len1 = a.size(); int len2 = b.size(); cout<< len1 << " " << len2 <

int main() { // Complete the program string a, b; cin >> a >> b;

// print sizes
cout << a.size() << " " << b.size() << endl;

// print concatenation
cout << a + b << endl;

// swap first characters
char temp = a[0];
a[0] = b[0];
b[0] = temp;

// print after swap
cout << a << " " << b << endl;

return 0;

}

Here is my code!

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    string a, b;
    cin >> a >> b;
    cout << a.size() << " " << b.size() << "\n";
    cout << a + b << "\n";
    char temp = a[0];
    a[0] = b[0];
    b[0] = temp;
    cout << a << " " << b;
    return 0;
}

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