3(b)

#include <iostream>
#include <vector>
#include <map>
#include <string>
#include <algorithm>
using namespace std;

#define ll long long

int main()
{
    string str;
    cout << "Enter the string: ";
    cin >> str;
    map< char, int > m;
    m['a'] = m['b'] = m['c'] = 2;
    m['d'] = m['e'] = m['f'] = 3;
    m['g'] = m['h'] = m['i'] = 4;
    m['j'] = m['k'] = m['l'] = 5;
    m['m'] = m['n'] = m['o'] = 6;
    m['p'] = m['q'] = m['r'] = m['s'] = 7;
    m['t'] = m['u'] = m['v'] = 8;
    m['w'] = m['x'] = m['y'] = m['z'] = 9;
    transform(str.begin(), str.end(), str.begin(), ::tolower);
    int n = str.size();
    cout << "Translated string: ";
    for(int i=0; i<n; i++) {
        if(str[i]>='0' && str[i]<='9') cout << str[i];
        else cout << m[str[i]];
    }
    cout << "\n";
    return 0;
}