#include <cstdio>
#include <cctype>
#include <iostream>
#include <cstring>
#include <cstdlib>
using namespace std;
const char prefix[] = "http://www.bilibili.com/video/av";
int cnt;
void ReadURL() {
	char ch;
	while ((ch = getchar()) != EOF) {
		if (std::tolower(ch) == 'a') break;
	}
	if (getchar() == EOF) exit(0);
    ch = getchar();
    if (!isdigit(ch)) {
        // not valid Id
        return;
    }
	printf("%s", prefix);
    printf("%c", ch);
	while((ch = getchar()) != EOF) {
		if (!isdigit(ch)) break;
		printf("%c", ch);
	}
	printf("\n");
}
int main(int argc, char* argv[]) {

    if (argc != 3) {
        std::cerr << "help: " << argv[0] << " in_file out_file";
        std::cerr << std::endl;
        exit(1);
    }

	freopen(argv[1], "r", stdin);
	freopen(argv[2], "w", stdout);
	while (1)
		ReadURL();
}