Green, yellow and pink ( just joke )

Dono, kasino and Indro are student's. Dono and Kaino are clever. They are from east Java so they are Javanese. Meanwhile, Indro is a little bit stupid but he always has idea to cover his stupidity. One day Mr. Alex asked them to make sentences by using the words : green, yellow and pink. Dono answered " The grass is green, banana is yellow and my t-shirt is pink. That's good,Mr. Alex said. " How about you kasino? oh, it's a piece of cake" The leaves are green, the wall is yellow and my bolster is pink. " Excellent!! and...how about you Indro?" Indro was a little bit confused but he could answer it. "well...the phone is ringing green, green, green! then I answer the phone and say " yellow, whois this? after that I put the phone and it's sound "Pinnnk!!!". Mr. Alex????