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#include <iostream>
#include <string.h>

using namespace std;

void sterge_caracter(char cuvant[], char caracter)
{
    char* p = strchr(cuvant, caracter);
    if(p!=NULL)
        strcpy(p, p + 1);
}

int main()
{
    char sir1[250], sir2[250];

    cin >> sir1 >> sir2;

    strlwr(sir1);
    strlwr(sir2);

    if (strlen(sir1) != strlen(sir2))
        cout << "NU";
    else
    {
        for(int i = 0; i < strlen(sir1); i++)
        {
            sterge_caracter(sir2, sir1[i]);
        }

        if (strlen(sir2) == 0)
            cout << "DA";
        else
            cout << "NU";
    }


    return 0;
}