#include<iostream>
using namespace std;
int main()
{
    char a[1000];
    int i=0,n=0;
    while((a[n]=getchar())!='\n')
        n++;
    n--;
    while(a[i]==a[n-i])
          i++;
    if(i>n/2) cout<<"yes";
    else cout<<"no";
    return 0;
}

s=input()
a=s[::-1]
if a==s:
    print("yes")
else:
    print("no")

string=str(input("input string"))
length=len(string)
count=0
for i in range(0,length-1):
    if string[i]!=string[-1-i]:
        count=1
        break
    else:
        continue
if count==0:
    print("yes")
else:
    print("no")
    

from math import floor

n = str(input())
m = floor((1/2)*len(n))
x = n[len(n)-m:]
if n[:m] == x[::-1]:
    print("yes")
else:
    print("no")