#include <stdio.h>


int main ()
{
	int current = 0;
	int new;
	int bits = 0;

	while (1) {
		if (scanf ("%d", &new) != 1)
			break;
		current <<= 16;
		current |= new;
		bits += 16;
		while (1) {
			int mask;
			if (bits < 4)
				break;
			mask = 1 << (bits - 1);
			if (current & mask) {
				current &= ~mask;
				bits -= 4;
				printf ("%c", "ernstl \n"[current >> bits]);
				current &= (1 << bits) - 1;

				continue;
			}
			if (bits < 7)
				break;
			mask >>= 1;
			if (current & mask) {
				int val;
				char ch;
				current &= ~mask;
				bits -= 7;
				val = current >> bits;
				current &= (1 << bits) - 1;
				if (val <= ('z' - 'a')) {
					ch = 'a' + val;
				} else {
					val -= 1 + 'z' - 'a';
					ch = ".,;:()"[val];
				}
				printf ("%c", ch);
				continue;
			}
			if (bits < 10)
				break;
			bits -= 10;
			printf ("%c", current >> bits);
			current &= (1 << bits) - 1;
		}
	}
	return 0;
}