C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,d,e;
	cin>>a;
	b=a/1000;
	c=a/100%10;
	d=a/10%10;
	e=a%10;
	if(d==b and e-c==4){
		cout<<"Yes";
	}
	else{
		cout<<"No";
	}
	return 0;
}

Python :

# coding=utf-8
a = input()
if int(a[0]) == int(a[2]) and int(a[3]) == int(a[1])+4:
    print("Yes")
else:
    print("No")