Mutant Flatworld explorers

#include<stdio.h>

#define MAXN 52

char Grid[MAXN][MAXN];
char Cmd[110];
char Side[] = "WNES";

int X[] = {0, -1, 0, 1};
int Y[] = {-1, 0, 1, 0};
int D[5];
int R, C;

void Ini() {
	int i;
	for(i = 0; Side[i]; i++) {
		D[Side[i]] = i; 
	}
}

void Move(int r, int c, int dir) {
	int i, tr, tc;
	for(i = 0; Cmd[i]; i++) {
		if(Cmd[i] == 'R') dir ++;
		else if(Cmd[i] == 'L') dir--;
		dir += 4;
		dir %= 4;
		if(Cmd[i] == 'F') {
			tc = Y[dir] + c;
			tr = X[dir] + r;
			if(tr > R || tc>C  || tr<0 || tc<0) {
				if(Grid[r][c] != 1) {
					printf("%d %d %c LOST\n",c,R - r,Side[dir]);
					Grid[r][c] = 1;
					return;
				}
			}
			else {
				r = tr;
				c =tc;
			}
		}
	}
	printf("%d %d %c\n",c, R - r, Side[dir]);
}

int main() {
	int sr, sc, dir;
	char input[100], ss[10];
	Ini();
	gets(input);
	sscanf(input,"%d%d",&C,&R);
	while(gets(input)) {
		gets(Cmd);
		sscanf(input,"%d%d%s",&sc,&sr,ss);
		dir = D[ss[0]];
		Move(R-sr,sc,dir);
	}
	return 0;
}