def writedata(fn1,fn2):
    f1=open(fn1,'r')
    f2=open(fn2,'a+')
    f2.write(f1.read())
    f1.close()
    f2.close()
    print("Successfully Write data")

f1name=input("Enter first file name")
f2name=input("Enter second file name")
writedata(f1name,f2name)