What did the postmaster do then?
The postmaster was deeply moved by Lencho's faith in God and decided not to shake it. To answer the letter, he came up with an idea to send the requested money. He asked for contributions from his employees, gave part of his salary, and obliged several friends to donate for an act of charity.
However, he could not gather the hundred pesos that Lencho had requested. He was only able to collect a little more than half the amount. He then put the money in an envelope addressed to Lencho and included a letter containing only a single word as a signature: God.
Explanation
The textbook mentions that the postmaster, struck by Lencho's immense faith, resolved to answer his letter so as not to shake that faith. He took practical steps to collect money from his employees, himself, and his friends. Since he couldn't collect the full hundred pesos, he sent whatever he could gather and signed the letter as 'God' to maintain the illusion that the money came from heaven.