#include <iostream>
#include <stdio.h>
using namespace std;
 
int main() {
 
	const char* _user = "FOO";
	const char* _password = "BAR";
	const char* _session = "ABCDEFGHIJ";
	int _expectedSeq = 123;
 
    char login[38];
    sprintf(login,
            "L%-6s%-10s%10s%10d\xA",
            _user,
            _password,
            _session,
            _expectedSeq);
 
    for (int i = 0; i < 38; i++) {
    	printf(" %02x", login[i] & 0xff);
    }
 
	return 0;
}

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