1. Code

#include <iostream>
#include <string>

using namespace std;

int main(void) {
    int ch[26] = {3,3,3,4,4,4,5,5,5,6,6,6,7,7,7,8,8,8,8,9,9,9,10,10,10,10};
    string word;
    int time = 0;

    cin >> word;
    for (int i=0 ; i<word.length() ; i++) {
        time += ch[word[i]-65];
    }

    cout << time << '\n';
    return 0;
}

2. Result

        Runtime : 0 ms, Memory usage : 2024 KB
        (Runtime can be different by a system even if it is a same code.)

Check out the my GitHub repo for more info on the code. If you have questions, you can leave a reply on this post.