In Matthew, what did the crowds shout as Jesus entered Jerusalem?

Answer: Hosanna!

The crowds shouted, "Hosanna to the Son of David! Blessed is He who comes in the name of the Lord! Hosanna in the highest!"

“The crowds that went ahead of Him and those that followed were shouting: “Hosanna to the Son of David!” “Blessed is He who comes in the name of the Lord!” “Hosanna in the highest!””— Matthew 21:9 (BSB)