extern void __VERIFIER_error() __attribute__ ((__noreturn__));

void __VERIFIER_assert(int cond) {
  if (!(cond)) {
    ERROR: __VERIFIER_error();
  }
  return;
}
int __VERIFIER_nondet_int();

  char x[100], y[100];
  int i,j,k;

int main() {
  k = __VERIFIER_nondet_int();

  i = 0;
  while(x[i] != 0){
    y[i] = x[i];
    i++;
  }
  y[i] = 0;

  if(k >= 0 && k < i)
    if(y[k] != 0)
      {__VERIFIER_assert(0);}

  return 0;
}