// editor1
#include<stdio.h>
#include<string.h>
#define MAX 5
int stack[MAX];
int top = - 1;
void push(int x)
{
 if(top== MAX - 1){
     printf("stack is full"); 
 } 
 else{
    stack[++top]=x;  
 }
}
    


void peek(){
if(top== -1){
    printf("stack is empty");
    
}
else{
    printf("%d",stack[top]);
}
}
int main(){
   
   int n;
scanf("%d",&n);
for(int i=0;i<n;i++)
char cmd[10]
scanf("%d",&cmd)
if(strcmd (cmd,"push")==0){
    int x;
    scanf("%d",&x);
    push(x);
    
}
else if(strcmd (cmd,"push")==0)
peek(x);
 
}