// verificarea daca un cuv este sau nu uniform (conditii:-nr lit mici=nr lit mari; -niciun alt caract in sir
#include <iostream>
#include <cstring>
using namespace std;

int main()
{
    char s[21];
    int i,ok=1,k=0,z=0;
    cout<<"s=";
    cin>>s;
    for(i=0;i<strlen(s);i++)
    {
        if(s[i]>='a'&&s[i]<='z')
            k++;
        if(s[i]>='A'&&s[i]<'Z')
            z++;

    }
    if(k==z&&k+z==strlen(s))
        cout<<"da";
    else
        cout<<"Nu";j


    return 0;
}