#include <stdio.h>

int stack[100];
int top = -1;

void push(int x){
    stack[++top] = x;
}

int pop(){
    return stack[top--];
}

int main(){
    push(1);
    push(2);
    push(3);
    push(4);
      
    for (int i = 0;i < 4;i++) {
        printf("%d\n",pop());
    }   
}

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