#include<stdlib.h>
#include<stdio.h>
#include<string.h>

int st[100],vf = -1;
char a[1];

int empty()
{
    if (vf == -1)
        return 1;
    else
        return 0;
}

void push()
{
    vf++;
    st[vf] = a[0];
}

void pop()
{
    vf--;
}

int main()
{
    int i,nr=0;
    int ok = 1;
    while (1)
    {
        scanf("%c", a);
        /*do{
            ok = 1;
            scanf("%c", a);
            if ((strcmp(a, "F") != 0 && strcmp(a, "G") != 0) && strcmp(a, "S") != 0)
            {
                printf("Nu ii bine\n");
                ok = 0;
            }
            scanf("%c", a);
        } while (ok==0);*/
        if (strcmp(a,"S")==0)
            break;
        if (empty() == 1)
            push();
        else if (a[0] != st[vf])
        {
            pop();
            nr++;
        }
        else
            push();
        scanf("%c",a);
    }

    printf("\n\nContinutul stivei este:\n");
    for (i = 0; i <= vf; i++)
    {
        printf("%c\n", st[i]);
    }
    printf("\nNumarul de evaporari este: %d", nr);
}