#include <stdio.h>
#include <cs50.h>
#include <string.h>
#include <ctype.h>

int main(int argc, string argv[])
{
    //ask user for input
    string s = get_string();

    //make sure get_string return a string
    if(s!=NULL)
    {
    //if first letter is a char, print it
    if(s[0] != ' '){

        //check to see if char is lowercase
        if(islower(s[0])){

        //print first letter, to uppercase
        printf("%c", toupper(s[0]));

         } else{

         //print first letter as it is
         printf("%c", s[0]);

         }
    }

    for(int i=0, n=strlen(s); i<n; i++){

        //iterate forward to get the index where char after space is at
        if(s[i-1] == ' ' && s[i] != ' '){

            //check to see if char is lowercase
            if(islower(s[i])){

                //print first letter, to uppercase
                printf("%c", toupper(s[i]));

             } else{

                 //print first letter as it is
                 printf("%c", s[i]);

                 }
            }
        }

        printf("\n");
        return 0;
    }
}