#include <iostream>
using namespace std;

int main()
{
char c;

while (...) {
if (...)
{
while ( ...)
{
...
}
}else if (...) {
int n = 0;

do {
...
for (...; ...; ...) {
...
}
...
} while (...);

cout << n;
}
else{
cout << c;
}
}

return 0;
}