#include <iostream>
#include <vector>

using namespace std;

const int N = 2e5;

string s, s1;

vector<string> elem;



bool IsUpper(char a) {
    return a >= 'A' && a <= 'Z';
}

bool IsLower(char a) {
    return a >= 'a' && a <= 'z';
}

bool IsNumber(char a) {
    return a >= '0' && a <= '9';
}

int main()
{
    cin >> s;
    int n = s.size();
    if (IsNumber(s[0])) {
        cout << "NO";
        return 0;
    }
    if (IsLower(s[0])) {
        cout << "NO";
        return 0;
    }
    if (s.size() == 1) {
        cout << "YES";
        return 0;
    }
    for (int i = 1; i <= n-1; i++) {
        if (s[i] == '0' && !IsNumber(s[i - 1])) {
            cout << "NO";
            return 0;
        }
    }
    for (int i = 1; i <= n-2; i++) {
        if (s[i] == '1' && !IsNumber(s[i - 1]) && !IsNumber(s[i+1])) {
            cout << "NO";
            return 0;
        }
    }
    if (s[n - 1] == '1' && !IsNumber(s[n - 2])) {
        cout << "NO";
        return  0;
    }
    for (int i = 0; i < n; i++) {
        if (IsUpper(s[i])) {
            s1.push_back(s[i]);
            continue;
        }
        if (IsLower(s[i])) {
            s1.push_back(s[i]);
            continue;
        }
        if (IsNumber(s[i])) {
            continue;
        }
        cout << "NO";
        return 0;
    }
    swap(s1, s);
    n = s.size();
    s1.clear();
    s1.push_back(s[0]);
    for (int i = 1; i < n; i++) {
        if (IsUpper(s[i])) {
            elem.push_back(s1);
            s1.clear();
        }
        s1.push_back(s[i]);
    }
    if (!s1.empty()) {
        elem.push_back(s1);
    }


    for (int i = 0; i < elem.size(); i++) {
        if (elem[i].size() > 2) {
            cout << "NO";
            return 0;
        }
        if (i > 0 && elem[i] == elem[i - 1]) {
            cout << "NO";
            return 0;
        }
    }
    cout << "YES";
    return 0;
}