#include <iostream>
#include <stack>

using namespace std;

#define MVNum 100

typedef int OtherInfo;
typedef string VerTexType;

typedef struct ArcNode
{
    int adjvex;
    struct ArcNode * nextarc;
    OtherInfo info;
}ArcNode;

typedef struct VNode
{
    VerTexType data;
    ArcNode *firstarc;
}VNode,AdjList[MVNum];

typedef struct
{
    AdjList vertices;
    int vexnum,arcnum;
}ALGraph;


int LocateVex(ALGraph G,VerTexType v)
{
    int i;
    for(i=0;i<G.vexnum;i++)
    {
        if(G.vertices[i].data==v) return i;
    }
    return -1;
}

int CreateUDG(ALGraph &G)
{
    int i,j,k;
    VerTexType v1,v2;
    ArcNode *p,*p2;
    cin>>G.vexnum>>G.arcnum;
    for(i=0;i<G.vexnum;i++)
    {
        cin>>G.vertices[i].data;
        G.vertices[i].firstarc=NULL;
    }
    for(k=0;k<G.arcnum;k++)
    {
        cin>>v1>>v2;
        i=LocateVex(G,v1);
        j=LocateVex(G,v2);
        p=new ArcNode;
        p->adjvex=j;
        p->nextarc=G.vertices[i].firstarc;
        G.vertices[i].firstarc=p;
        p2=new ArcNode;
        p2->adjvex=i;
        p2->nextarc=G.vertices[j].firstarc;
        G.vertices[j].firstarc=p2;
    }
    return 1;
}

void DFS_AL2(ALGraph G)
{
    bool visited[MVNum]={false};
    stack<int> S;
    cout<<G.vertices[0].data<<" ";
    visited[0]=true;
    S.push(0);
    ArcNode *p;
    while(!S.empty())
    {
        p=G.vertices[S.top()].firstarc;
        while(p&&visited[p->adjvex])//选择
        {
            p=p->nextarc;
        }
        while(p&&!visited[p->adjvex])//走这个方向
        {
            cout<<G.vertices[p->adjvex].data<<" ";
            visited[p->adjvex]=true;
            S.push(p->adjvex);
            p=G.vertices[p->adjvex].firstarc;
        }
        if(p==NULL)
        {
            S.pop();
        }
    }
}

int main()
{
    ALGraph G;
    CreateUDG(G);
    DFS_AL2(G);
}