#include <iostream>
#include <cstring>
using namespace std;
int main()
{
    char s[101], acr[101], k(0), *p;
    int i;
    cin.getline(s, 101);
    p = strtok(s, " ");
    while(p)
    {
        if(isupper(p[0])) {
            acr[k] = p[0];
            k++;
        }
        p = strtok(NULL, " ");
    }
    acr[k] = '\0';
    return 0;
    cout << acr;
}