#include <stdio.h>
#include <stdint.h>
#include <string.h>
#define MAX 10
int stack[MAX];
int top = -1;
/* Push operation */
void push(int x)
{
if (top == MAX - 1)
{
printf("Stack Overflow\n");
return;
}
stack[++top] = x;
}
/* Pop operation */
void pop(void)
{
if (top == -1)
{
printf("Stack Underflow\n");
return;
}
printf("%d\n", stack[top--]);
}
void process_stack(int n) {
char command[10];
int value;
for (int i = 0; i < n; i++)
{
scanf("%s", command);
if (strcmp(command, "push") == 0)
{
scanf("%d", &value);
push(value);
}
else if (strcmp(command, "pop") == 0)
{
pop();
}
}
}
int main() {
int n;
scanf("%d", &n);
getchar(); // Consume newline after number
process_stack(n);
return 0;
}