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#include <err.h>
#include <stdio.h>
#include <stdlib.h>
int
main(void)
{
int x, y, ch;
#ifdef PART1
int keypad[][5] = {
{0, 0, 0, 0, 0},
{0, 1, 2, 3, 0},
{0, 4, 5, 6, 0},
{0, 7, 8, 9, 0},
{0, 0, 0, 0, 0}
#elif defined PART2
int keypad[][7] = {
{0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 1, 0, 0, 0},
{0, 0, 2, 3, 4, 0, 0},
{0, 5, 6, 7, 8, 9, 0},
{0, 0, 'A', 'B', 'C', 0, 0},
{0, 0, 0, 'D', 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0},
#endif
};
FILE *fp = fopen("input", "r");
if (fp == NULL)
err(EXIT_FAILURE, "fopen: 'input'");
x = y = 3;
while ((ch = fgetc(fp)) != EOF) {
switch (ch) {
case 'U':
if (keypad[y - 1][x] != 0)
y--;
break;
case 'D':
if (keypad[y + 1][x] != 0)
y++;
break;
case 'L':
if (keypad[y][x - 1] != 0)
x--;
break;
case 'R':
if (keypad[y][x + 1] != 0)
x++;
break;
case '\n':
putchar(keypad[y][x] <= 9
? keypad[y][x] + '0'
: keypad[y][x]);
}
}
putchar('\n');
fclose(fp);
}
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