C++

#include<bits/stdc++.h>
#define int long long
using namespace std;

bool ispal(int a){
    string s=to_string(a);
    string b=to_string(a);
    reverse(b.begin(),b.end());
    return s==b;
}
int pal(int a){
    string s=to_string(a);
    reverse(s.begin(),s.end());
    return stoll(s);
}
signed main(){
    int n,step=0;
    cin>>n;
    do{
        n+=pal(n);
        step++;
        if (step>=30){cout<<-1;exit(0);}
    }while(!ispal(n));
    cout<<step;
    return 0;
}