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#include <cstdio>

#include <cstring>

#define ELEMENT_COUNT 100000

using namespace std;

// Requirement: every element in stack must be positive.

// Otherwise, M[0] should be set to -INF.

int S[ELEMENT_COUNT], M[ELEMENT_COUNT];

int sp = 1;

void push(int x)

{

S[sp] = x;

if (x > M[sp - 1])

{

M[sp] = x;

}

else

{

M[sp] = M[sp - 1];

}

sp++;

}

int pop()

{

return S[--sp];

}

bool empty()

{

return sp == 1;

}

int get_max()

{

return M[sp - 1];

}

int main()

{

while (true)

{

char o[10];

int a;

scanf(" %s", o);

if (strcmp(o, "push") == 0)

{

scanf("%d", &a);

push(a);

}

else if (strcmp(o, "pop") == 0)

{

printf("%d\n", pop());

}

else if (strcmp(o, "getmax") == 0)

{

printf("%d\n", get_max());

}

else if (strcmp(o, "abort") == 0)

{

return 0;

}

else

{

printf("No such instruction.\n");

}

}

return 0;

}