import math
def firstLastDigit(num:int)->int:
#Determining number of digits present in the input
noOfDigits = int(math.log10(num))
#Extracting lastdigit
lastD=num%10
#Extracting firstDigit
firstD=int(num/ pow(10, noOfDigits))
#print(num)
# print(lastD, firstD)
#Removed last digit and added the first didit to the last
swapNum=int(num/10)*10+firstD
#Adding the required part in the num
required= (lastD-firstD)*(pow(10, noOfDigits))
#Adding the required in the swapNum
swapNum=required+swapNum
return swapNum
print(firstLastDigit(7456542))
