West Bengal Chief Minister Mamata Banerjee today greeted President Pranab Mukherjee on his 81st birthday and wished him a healthy life. <br/><br/>In a tweet message, she said "Birthday greetings to honorable and most respected Rashtrapataji" . Bhalo thakun Pranab Da" (meaning, stay well Pranab Da), Ms. Banerjee said in the message to president with whom she has had a long political association.