Submission #3377933

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Source Code Expand

#include<iostream>
#include<ctype.h>
#include<queue>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
inline int read(){
	int x=0,f=0;char ch=getchar();
	while(!isdigit(ch))f|=ch=='-',ch=getchar();
	while(isdigit(ch))x=x*10+(ch^48),ch=getchar();
	return f?-x:x;
}
int main(){
    string s;
    int ans=0;
    cin>>s;
    for(int i=0;i<4;++i){
		if(s[i]=='B'){
			cout<<"no\n";return 0;
		}
        if(i!=2 && (s[i]=='A' || s[i]=='D' || s[i]=='O' || s[i]=='P' || s[i]=='Q' || s[i]=='R')){
        	cout<<"no\n";return 0;
		}
		if(i==2 && !(s[i]=='A' || s[i]=='D' || s[i]=='O' || s[i]=='P' || s[i]=='Q' || s[i]=='R')){
			cout<<"no\n";return 0;
		}
	}
    cout<<"yes\n";
    return 0;
}

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