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package hello;
import java.io.*;
import java.util.*;
public class Main {
public static class CustomStack {
int[] data;
int tos;
public CustomStack(int cap) {
data = new int[cap];
tos = -1;
}
int size() {
return tos + 1;
}
void display() {
for(int i = tos; i >= 0; i--){
System.out.print(data[i] + " ");
}
System.out.println();
}
void push(int val) {
if (tos == data.length - 1) {
System.out.println("Stack overflow");
} else {
tos++;
data[tos] = val;
}
}
int pop() {
if (tos == -1) {
System.out.println("Stack underflow");
return -1;
} else {
int val = data[tos];
tos--;
return val;
}
}
int top() {
if (tos == -1) {
System.out.println("Stack underflow");
return -1;
} else {
return data[tos];
}
}
}
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int n = Integer.parseInt(br.readLine());
CustomStack st = new CustomStack(n);
String str = br.readLine();
while(str.equals("quit") == false){
if(str.startsWith("push")){
int val = Integer.parseInt(str.split(" ")[1]);
st.push(val);
} else if(str.startsWith("pop")){
int val = st.pop();
if(val != -1){
System.out.println(val);
}
} else if(str.startsWith("top")){
int val = st.top();
if(val != -1){
System.out.println(val);
}
} else if(str.startsWith("size")){
System.out.println(st.size());
} else if(str.startsWith("display")){
st.display();
}
str = br.readLine();
}
}
}
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