done $=$ False

factor $=0\mathrm{.}0$

while not done :

getSecond $=$ True

command $=$ input$("$From unit $($in$,$ cm$,$ m$,$ again, quit$)$: $")$

print$()$

if command $=="$in$"$ :

factor $=2\mathrm{.}54$

unit$1=$ command

elif command $=="$cm$"$ :

# Your code goes here

elif command $=="$m$"$ :

# Your code goes here

elif command $==$ "again" :

getSecond $=$ False

elif command $==$ "quit" :

done $=$ True

getSecond $=$ False

else :

print$("$Sorry$,$ unknown unit."$)$

getSecond $=$ False

if getSecond :

unit$2=$ input$("$To unit: $")$

print$()$

if unit$2=="$in$"$ :

factor $=$ factor $/2\mathrm{.}54$

elif # Your code goes here

elif # Your code goes here

print$("$Sorry$,$ unknown unit."$)$

# Your code goes here

if not done and factor $!=0\mathrm{.}0$ :

value $=$ float$($input$("$Enter the value to be converted: $"))$

print$()$

print$($value$,$ unit$1,"=",$ value $*$ factor, unit$2)$