#include <stdio.h>
int stack[100];
int top = -1;
void push(int x){
stack[++top] = x;
}
int pop(){
return stack[top--];
}
int main(){
push('C');
push('O');
push('R');
push('Y');
for (int i = 0;i < 4;i++) {
printf("%c",pop());
}
}
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