Step-by-step explanation:
The story you mentioned is called "Prince Ivan, the Self-Playing Gusla, Koshchey the Deathless, and the Fox as Midwife." It's a popular Russian fairy tale that combines various elements from different stories. It tells the tale of Prince Ivan and his adventures, including encounters with the mythical figure Koshchey the Deathless, a self-playing musical instrument called the Gusla, and the clever fox who acts as a midwife.