2ra retake

#include <iostream>
#include <string>
#include <vector>
#include <cctype>


std::vector<char> readInput() {
	std::vector<char> vec;
	char a;
	std::cin >> a;
	while (a != '.') {
		vec.push_back(a);
		std::cin >> a;
	}
	return vec;
}

void findHiddenNumber(std::vector<char>& vec) {
	int sum = 0;

	for (size_t i = 0; i < vec.size(); ++i) {
		if (isdigit(vec[i])) {
			sum += (vec[i] - '0');
		}
	}

	if (sum >= 65 && sum <= 90 || sum >= 97 && sum <= 122) {
		std::cout << char(sum);
	}
	else {
		std::cout << sum;
	}
}

int main() {
	std::vector<char> vec = readInput();
	findHiddenNumber(vec);
}