#include<bits/stdc++.h>
using namespace std;
#define MAXN 101
#define QelemType int
#define Status int
typedef struct{
 QelemType *base;
 int front;
 int rear;
}SqQueue;
Status InitQueue(SqQueue &q)
{
 q.base = new QelemType[MAXN];
 if(!q.base)
   {
    cout<<"初始化错误"<<endl; 
     return 0; 
   }
 q.front=q.rear=0;  
}
Status Queuelength(SqQueue q)
{
 return (q.rear-q.front+MAXN)%MAXN;
}
Status EnQueue(SqQueue &q,QelemType e) 
{
 if((q.rear+1)%MAXN==q.front)
 {
  cout<<"队列已满"<<endl;
  return 0;
 }
 q.base[q.rear] = e;
 q.rear = (q.rear+1)%MAXN;
 cout<<"入队完成"<<endl;
 return 1;
 
}
Status OutQueue(SqQueue &q)
{
 if(q.front==q.rear)
  {
   cout<<"队列为空"<<endl;
   return 0;
  }
  int e;
  e = q.base[q.front];
  q.front = (q.front+1)%MAXN;
  cout<<e;
  cout<<"出队完成"<<endl;
  return 1;
  
}
void ReadQueue(SqQueue q)
{
 if(q.front==q.rear)
  {
   cout<<"队列为空"<<endl;
   return ;
  }
 for(int i=q.front;;i=(i+1)%MAXN)
  {
     if(i==q.rear)
    break;
   cout<<q.base[i]<<" ";
   
   } 
   cout<<endl;
}
void menu()
{
 cout<<"1、初始化"<<endl<<"2、入队"<<endl<<"3、出队"<<endl<<"4、全队阅览"<<endl<<"5、求队列长度"<<endl<<"6、退出程序"<<endl;
}
int main()
{
 SqQueue que;
 menu();
 while(1)
 {
  int n;
  cin>>n;
  switch(n)
  {
   case 1:
    InitQueue(que);
    break;
   case 2:
    int x;
    cin>>x;
       EnQueue(que,x);
    break;
   case 3:
       OutQueue(que);
             break;
   case 4:
       ReadQueue(que);
    break;
   case 5:
       cout<<Queuelength(que)<<endl;
    break;
   case 6:
       exit(0);     
  }
 }
 return 0;
 }