zadacha za 22.12

#include <iostream>
#include <string>
using namespace std;

string encodeMessage(const string message, int n) {
    string encodedMessage = "";
    for (char ch : message) {
        if (isalpha(ch)) {
            char base = isupper(ch) ? 'A' : 'a';
            encodedMessage += static_cast<char>((ch - base + n) % 26 + base);
        }
        else {
            // If the character is not a letter, keep it unchanged
            encodedMessage += ch;
        }
    }
    return encodedMessage;
}
int main() {

    string message;
    int n;
    getline(cin, message);
    cin >> n;
    if (n < 0 || n > 25) {
        cout << "Invalid input data!" << endl;
        return 0;
    }
    string result = encodeMessage(message, n);
    cout << result << endl;
    return 0;
}