注意制表符'\t' 也需要大写 

#include<bits/stdc++.h>
using namespace std;

int main(){


    string s;
    while(getline(cin,s))
    {
        if(s[0]>='a'&&s[0]<='z')
        {
           s[0]=s[0]+'A'-'a';
        }

    for(int i=1;i<s.size();i++)
    {
        if(s[i]==' '||s[i]=='\t')
        {
            if(s[i+1]>='a'&&s[i+1]<='z')
            s[i+1]=s[i+1]+'A'-'a';
        }

    }
    cout<<s<<endl;
    }

	return 0;
}