str1 ='good'
str2 ='bye'
print str1+str2
print 'very '+str1
print str1+' and '+str2
num= 39
print 'My age is '+str(num)
print 'My age is %d' %num
print 'Price is %f' %4.99
print 'Price is %.2f' %4.99
name ='Yan Chen'
print '%s is a good leader.' %name