20200217 training match L1 - 7 2019 is coming (20 points)

Judge number sequence S Whether it is composed of several 2019 Spliced .

Input format :

Each line gives a length of n A sequence of numbers （ By digital 0~9 form , There are no other characters in the middle , length n<80）.

Output format :

For a sequence of numbers , Give the judgment result “Yes” or “No”. Each output takes up one line .

sample input :

20192019

201920

sample output :

Yes

No

#include <bits/stdc++.h>
using namespace std;
int main()
{
    
	string s;
	while(getline(cin,s))
	{
    
		while(s.substr(0,4)=="2019")//substr(a,b), from a Start , The intercept length is b String 
		{
    
			s.erase(0,4);// from a Start , The deletion length is b
		}
		if(s.length()==0)cout<<"Yes"<<endl;
		else cout<<"No"<<endl;
	}
	return 0;
}