#include <bits/stdc++.h>
using namespace std;
bool palindrom(char s[])
{
    int j=strlen(s)-1,i=0;
    while(i<j)
    {
        if(s[i]!=s[j])return 0;
        i++;j--;
    }
    return 1;
}
void oglindire(char s[])
{
    int n,i;
    char aux;
    n=strlen(s);
    for(i=0;i<n/2;i++)
       {
           aux=s[i]; s[i]=s[n-i-1]; s[n-i-1]=aux;
       }
}
int main()
{
    char s[101],*p,t[101]="";
    int n=0,ok=0;
    cin.getline(s,100);
    p=strtok(s," ");
    while(p)
    {
        if(strlen(p)%2==1)
        {
           if(palindrom(p)==0)
                  {oglindire(p);ok=1;}
        }
        if(n!=0) strcat(t," ");
        n++;
        strcat(t,p);
        p=strtok(NULL," ");
    }
    strcpy(s,t);
    if(ok==1)cout<<s;
    else cout<<"nu exista";
    return 0;
}