10424 - Love Calculator

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl '\n'
#define sz(x) int(x.size())
#define all(x) x.begin(), x.end()

int sum_of_digits(int x) {
    int sum = 0;
    while (x > 0) sum += x % 10, x /= 10;
    return sum;
}

int calc(char *s, int n) {
    int sum = 0;
    for (int i = 0; i < n; i++) {
        if (isalpha(s[i])) sum += tolower(s[i]) - 'a' + 1;
    }
    while (sum > 9) sum = sum_of_digits(sum);
    return sum;
}

int main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    char name1[30], name2[30];
    while (scanf("%[^\n]%*c%[^\n]%*c", name1, name2) != EOF) {
        int c1 = calc(name1, strlen(name1)), c2 = calc(name2, strlen(name2));
        if (c1 > c2) swap(c1, c2);
        printf("%.2f %%\n", 100.0 * c1 / c2);
    }
}