#include <iostream>
#include <string>
#include <cctype>
using namespace std;
 
enum action { ENCRYPT, DECRYPT };
string crypt(action type, int nrails, string data) {
	int cyclesize = 2*(nrails-1);
	string ret(data);
	int pos = 0, i, a;
	int& rpos = type ? i : pos, &dpos = type ? pos : i;
	for (int rail = 0; rail < nrails; ++rail) {
		for (i = rail, a = 2*rail; i < data.length(); a = cyclesize - a, i += a) {
			if (a==cyclesize) continue;
			ret[rpos] = data[dpos];
			++pos;
		}
	}
	return ret;
}
 
int main() {
	string data;
	action act;
	int nrails;
	cin >> data >> nrails;
	if (data == "enc") act = ENCRYPT;
	else if (data == "dec") act = DECRYPT;
	else {
		cout << "Unknown action.\n";
		return 1;
	}
 
	while (isspace(cin.peek())) cin.ignore();
	getline(cin, data);
 
	cout << crypt(act, nrails, data);
	return 0;
}

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

ZGVjIDYgQUFQTEdNRVNBUEFNQUlUSFRBVExFQUVETE9aQkVO

dec 6 AAPLGMESAPAMAITHTATLEAEDLOZBEN