#include <algorithm>
#include <array>
#include <cstdio>
#include <iostream>
#include <string>
#include <vector>
 
using namespace std;
 
#define N 5 // Assumed positive number smaller than str.size()
 
int main() {
	const string str("atgctgttg");
	const int n1 = N - 1;
	vector<array<char, N>> result(str.size() - n1);
 
	transform(str.cbegin(), str.cend() - n1, result.begin(), [](const auto& i) {
		array<char, N> result;
 
		copy_n(&i, N, result.begin());
		return result;
	});
 
	for (auto& i : result) {
		printf("%.*s\n", N, &i);
	}
}

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