#include <stdio.h>
#include <stdint.h>
#include <string.h>
#define MAX 10
void process_stack(int n) {
// Your logic here
int stack[MAX];
int top = -1;
char command[20];
for (int i = 0; i < n; i++)
{
scanf("%s", command);
if (strcmp(command, "push") == 0)
{
int val;
scanf("%d", &val);
if (top == MAX - 1)
{
printf("Stack Overflow\n");
}else {
stack[++top] = val;
}
}else if (strcmp(command, "pop") == 0) {
if (top == -1) {
printf("Stack Underflow\n");
} else {
printf("%d\n", stack[top--]);
}
}
}
}
int main() {
int n;
scanf("%d", &n);
getchar(); // Consume newline after number
process_stack(n);
return 0;
}