#include using namespace std; #define REP(i,a,b) for(i=a;i'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);} void reader(ll *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);} void reader(double *x){scanf("%lf",x);} int reader(char c[]){int i,s=0;for(;;){mygc(i);if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF) break;}c[s++]=i;for(;;){mygc(i);if(i==' '||i=='\n'||i=='\r'||i=='\t'||i==EOF) break;c[s++]=i;}c[s]='\0';return s;} template void reader(T *x, S *y){reader(x);reader(y);} template void reader(T *x, S *y, U *z){reader(x);reader(y);reader(z);} template void reader(T *x, S *y, U *z, V *w){reader(x);reader(y);reader(z);reader(w);} void writer(int x, char c){int s=0,m=0;char f[10];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);} void writer(ll x, char c){int s=0,m=0;char f[20];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);} void writer(double x, char c){printf("%.15f",x);mypc(c);} void writer(const char c[]){int i;for(i=0;c[i]!='\0';i++)mypc(c[i]);} void writer(const char x[], char c){int i;for(i=0;x[i]!='\0';i++)mypc(x[i]);mypc(c);} template void writerLn(T x){writer(x,'\n');} template void writerLn(T x, S y){writer(x,' ');writer(y,'\n');} template void writerLn(T x, S y, U z){writer(x,' ');writer(y,' ');writer(z,'\n');} template void writerArr(T x[], int n){int i;if(!n){mypc('\n');return;}rep(i,n-1)writer(x[i],' ');writer(x[n-1],'\n');} char memarr[17000000]; void *mem = memarr; #define MD 1000000007 int x, y, d; char mp[100][100]; char vis[100][100][4]; int dx[4] = {-1,1,0,0}, dy[4] = {0,0,-1,1}; void print(const char c[]){ puts(c); fflush(stdout); } #define INF 1000000000 int dist[100][100]; int st[10000], sts; void get_dist(int x, int y){ int i, j, k, ni, nj; rep(i,100) rep(j,100) dist[i][j] = INF; dist[x][y] = 0; st[0] = x*100+y; sts=1; while(sts){ k = st[--sts]; i = k/100; j = k%100; rep(k,4){ ni = i + dx[k]; nj = j + dy[k]; if(mp[ni][nj]!='.') continue; if(dist[ni][nj]==INF) dist[ni][nj] = dist[i][j], st[sts++] = ni * 100 + nj; } } } int main(){ int i, j, k; char buf[1000]; int nx, ny; int cnt = 0; rep(i,100) rep(j,100) mp[i][j] = '?'; x = y = 50; mp[x][y] = '.'; for(;;){ gets(buf); if(buf[0]=='M') break; k = atoi(buf); if(k>=20000){ print("F"); continue; } vis[x][y][d] = 1; nx = x; ny = y; rep(i,k){ mp[nx][ny] = '.'; nx += dx[d]; ny += dy[d]; } mp[nx][ny] = '#'; rep(k,4) if(vis[x][y][k]==0) break; if(k!=4){ print("L"); continue; } rep(i,100) rep(j,100) if(vis[i][j][0]==0) nx = i, ny = j; get_dist(nx, ny); if(dist[i][j] > dist[i+dx[d]][j+dy[d]]){ print("F"); continue; } print("L"); } return 0; }