#include<stdio.h>
int strLen(char x[]){
    int i = 0;
    while (i!=-1){
        if (x[i] == 0) break;
        i++;
    }
    return i;
}
int isPlaindrome(char x[]){
    int i,f=1;
    int n = strLen(x);
    for (i=0;i<n/2;i++){
        if (x[i]!=x[n-i]){
            f=0;
            break;
        }
    }
    return f;
}
int main (){
    char x[256];
    scanf("%s",x);
    if (isPlaindrome(x)==1){printf("plaindrome\n");}
    else {printf("not plaindrome\n");}
    return 0;
}