Save Ironman

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

using namespace std;

int take_alphabet(string &s, int n){
    int i;
    for(i = 0; i < n; i++){
        s[i] = tolower(s[i]);
        if(s[i] >= 'a' && s[i] <= 'z'){
            continue;
        }
        else{
            s.erase(i,1);
            i--; n--;
        }
    }
    return n;
}

void reverse_str(string &s, int n){
    int i = 0, j = n-1;
    while(i < j){
        s[i] = tolower(s[i]);
        s[j] = tolower(s[j]);
        char temp = s[i];
        s[i] = s[j];
        s[j] = temp;
        i++; j--;
    }
}

int main(){
    int t; cin >> t;
    while(t--){
        string str;
        cin.ignore();
        getline(cin , str);
        int n = str.length();
        n = take_alphabet(str, n);
        //cout << str << endl;
        string rev = str;
        n = rev.length();
        reverse_str(rev, n);
        //cout << rev << endl;
        int flag = 0;
        for(int i = 0; i < n; i++){
            if((str[i] >= 'a' && str[i] <= 'z') &&(rev[i] >= 'a' && rev[i] <= 'z')){
                if(str[i] != rev[i]){
                    flag = 1;
                    break;
                }
            }
        }
        if(flag) cout << "NO\n";
        else cout << "YES\n";
    }
}