#include<iostream>
using namespace std;
const int MaxSize=10;
class MGraph
{
	char vertex[MaxSize];
	int arc[MaxSize][MaxSize];
	int vertexNum,arcNum;
public:
	MGraph(char a[],int n,int e);
	~MGraph(){}
	void DF(int v,int visited[]);
	void BF(int v,int visited[]);
};
MGraph::MGraph(char a[],int n,int e)
{
	vertexNum=n;arcNum=e;
	for(int i=0;i<vertexNum;i++)
		vertex[i]=a[i];
	for(int q=0;q<vertexNum;q++)
		for(int b=0;b<vertexNum;b++)
			arc[q][b]=0;
	int z,x;
	for(int c=0;c<arcNum;c++)
	{
		cout<<"input:";
		cin>>z>>x;
		arc[z][x]=1;
		arc[x][z]=1;
	}
}
void MGraph::DF(int v,int visited[])
{
	cout<<vertex[v];
	visited[v]=1;
	for(int j=0;j<vertexNum;j++)
		if(arc[v][j]==1&&visited[j]==0)
		   DF(j,visited);
}
void MGraph::BF(int v,int visited[])
{
	int Q[MaxSize];
	int front=-1,rear=-1;
	cout<<vertex[v];
	visited[v]=1;
	Q[++rear]=v;
	while(front!=rear)
	{
		v=Q[++front];
		for(int j=0;j<vertexNum;j++)
		{
			if(arc[v][j]==1&&visited[j]==0)
			{
				cout<<vertex[j];
				visited[j]=1;
				Q[++rear]=j;
			}
		}
	}
}
int main()
{
	char ch[]={'A','B','C','D','E'};
	int visited[MaxSize];
	for(int i=0;i<MaxSize;i++)
		visited[i]=0;
	MGraph MG(ch,5,6);
	cout<<"DF"<<endl;
	MG.DF(0,visited);
	for(int a=0;a<MaxSize;a++)
		visited[a]=0;
	cout<<endl<<"BF"<<endl;
	MG.BF(0,visited);
	cout<<endl;
	return 0;
}