рунки))

#include <iostream>
using  namespace std;
int main()
{
    char x;
    int q = 1;
    while (cin >> x && q != 6)
    {
        switch (q)
        {
        case 1:
            if (x >= 'A' && x <= 'Z')
                q = 2;
            else
                q = 6;
            break;
        case 2:
            if (x >= 'a' && x <= 'z')
                q = 3;
            else
                q = 6;
            break;
        case 3:
            if (x >= 'a' && x <= 'z')
                q = 4;
            else if (x >= 'A' && x <= 'Z')
                q = 2;
            else
                q = 6;
            break;
        case 4:
            if (x >= 'a' && x <= 'z')
                q = 5;
            else if (x >= 'A' && x <= 'Z')
                q = 2;

            else
                q = 6;
            break;
        case 5:
            if (x >= 'A' && x <= 'Z')
                q = 2;
            else
                q = 6;
            break;

        }


    }

    if (q == 1 || q == 2 || q == 6) cout << "No";
    else cout << "Yes";

}