#include<bits/stdc++.h>
using namespace std;
int len,x[1000],y[1000],way,cnt;
bool mp[51][51],flag;
string a;
void init()
{
	flag=false;
	memset(mp,false,sizeof(mp));
	for(int i=11;i<=30;i++)
	{
		x[i-10]=25;
		y[i-10]=i;
		mp[x[i]][y[i]]=true;
	}
	cnt=20;
}
//1 up
//2 down
//3 left
//4 right
void f(int w,int step)
{
	if(way==1)
	{
		x[cnt]=x[cnt-1]-1;
		y[cnt]=y[cnt-1];
	}
	if(way==2)
	{
		x[cnt]=x[cnt-1]+1;
		y[cnt]=y[cnt-1];
	}
	if(way==3)
	{
		x[cnt]=x[cnt-1];
		y[cnt]=y[cnt-1]-1;
	}
	if(way==4)
	{
		x[cnt]=x[cnt-1];
		y[cnt]=y[cnt-1]+1;
	}
	mp[x[cnt-20+1]][y[cnt-20+1]]=false;
	if(mp[x[cnt]][y[cnt]]==true)
	{
		printf("The worm ran into inself on move %d.\n",step);
		flag=true;
	}
	else if(x[cnt]>50||y[cnt]>50||x[cnt]<1||y[cnt]<1)
	{
		printf("The worm ran off the board on move %d.\n",step);
		flag=true;
	}
	else mp[x[cnt]][y[cnt]]=true;
}
int main()
{
//	freopen("worm.in","r",stdin);
//	freopen("worm.out","w",stdout);
	while(true)
	{
		cin>>len;
		if(len==0) break;
		cin>>a;
		init();
		for(int k=0;k<=len;k++)
		{
			if(a[k]=='N') way=1;
			if(a[k]=='S') way=2;
			if(a[k]=='W') way=3;
			if(a[k]=='E') way=4;
			cnt++;
			f(way,k+1);
			if(flag==true) break;
		}
		if(flag==true) continue;
		printf("The worm successfully made all %d moves.\n",len);
	}
	return 0;
}

样例可以过，不知道哪里出了问题