#include<stdio.h>
#include<string>
#include<iostream>
using namespace std;

#define StackSize 100
typedef char DataType;
typedef struct{
    DataType data[StackSize];
    int top;
}SeqStack;
/*void Int(SeqStack *s){
    s->top=-1;
}*/
int judge(SeqStack *s,char *t){

    int i,len;
    char
 
 temp;
    len=strlen(t);
    for ( i = 0; i <len/2; i++)
    {if(s->top<StackSize-1){
        s->data[++s->top]=t[i];
    }else
    {
        printf("Stack Overflow");
        exit;
    }

    }
    if (len%2==1) i++;
    while (s->top>-1)
    {
        temp=s->data[s->top--];
        if
 
 (temp!=t[i]) return 0;
        else    i++;
    }
    return 1;
}
int main(){
    SeqStack *s;
    s=(SeqStack*)malloc(sizeof(SeqStack));//注意這裡如果是C語言先要初始化，不然會出錯。
    s->top=-1;
    char t[250];
    cin>>t;
    cout<<judge(s,t)<<endl;

}