#include<iostream> 
#include<sstream>
#include<string>
using namespace std;
int main(void) 
{
long int x,p=0;
cin>>x;
for(int i=0;i<x;i++){
long int n; 
long int m;
cin>>m;
m++;
string a; 
ostringstream ss;
ss << m;
a = ss.str();
while(true){
int licz=0,temp=0;    
bool t=true;
for(int k=a.size(),j=-1;k>=0;k--,j++){
        if(a[k]==' '){
                   k-=1;
                   temp--;
                   }
        if(a[j]==' '){
                   j+=1;
                   temp--;
                   }
        if(a[k]==a[j] || a[k]=='\0')licz+=1;
        else t = false;
        if(k==j)break;
        }
if(t==true){
            istringstream iss(a);
            iss >> n;
            cout<<n; 
            break;
            }
else {  
     istringstream iss(a);
     iss >> n;   
     n++;   
     ostringstream ss;
     ss << n;
     a = ss.str();
     } 
}//while
}//for
//getchar();
//return 0;  
}

...why wrong answer ?