El Analfabeto (1961)

Inocencio Prieto y Calvo receives a letter telling him he is the heir to his uncle's fortune of two million pesos. Not being able to read he has no idea of who sent the letter or its content. So he goes to the drugstore because the pharmacist can read the letter to him. But while waiting to be helped he sees that a young girl can read. He figures he has to be able to discover the letter's content by himself and decides he will save the letter and go to school, and wait to read the letter on his own.