#include <bits/stdc++.h>
#define przxct ""
#define fto(i,j,h)    for (int i=j; i<=h; ++i)
#define maxn
#define ll long long
#define pi 3.141592653589

using namespace std;

string s;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> s;
    int n = s.length();
    s = " " + s;
    for (int i = 1; i <= n; i += 2)
    {
        if (s[i] < 'a' || s[i] > 'z')
        {
            cout << "No";
            return 0;
        }
    }
    for (int i = 2; i <= n; i += 2)
    {
        if (s[i] < 'A' || s[i] > 'Z')
        {
            cout << "No";
            return 0;
        }
    }
    cout << "Yes";
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
using lli = long long;
#define rep(i,n) for(int i=0;i<n;i++)
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
template<class T>
ostream &operator<<(ostream &os, const vector<T> &x){
    os << "{";
    for(size_t i = 0; i < x.size(); i++){
        if(i < x.size()-1) os << x[i] << ", ";
        else os << x[i];
    }
    os << "}";
    return os;
}

int main(void){
    int n;
    cin >> n;
    n-=1;
    n/=100;
    cout << n+1 << endl;

    return 0;
}
