Capitalization

#include <iostream>
#include <stdio.h>

using namespace std;

int main()
{
    int N, k = 0;
    cin >> N;
    char a;
    a = getchar();
    string s = "";
    if (N > 0) {
    for (int i = 0; i < 100; i++) {
        a = getchar();
        if (a == '\n') break;
        if (a == ' '){
           s+=a;
           k = 0;
           continue;
        }
        if ((k == 0) and (a > 96)) s+=a-32;
        if ((k == 0) and (a < 96)) s+=a;
        if ((k > 0) and (a > 96)) s+=a;
        if ((k > 0) and (a < 96)) s+=a+32;
        k++;
    }}
    return 0;
}