program distance
real::x1,x2,y1,y2,d
read *,x1,y1,x2,y2
d=sqrt((x2-x1)**2+(y2-y1)**2)
print *,'The distance is:',d
end program distance
cHJvZ3JhbSBkaXN0YW5jZQpyZWFsOjp4MSx4Mix5MSx5MixkCnJlYWQgKix4MSx5MSx4Mix5MgpkPXNxcnQoKHgyLXgxKSoqMisoeTIteTEpKioyKQpwcmludCAqLCdUaGUgZGlzdGFuY2UgaXM6JyxkCmVuZCBwcm9ncmFtIGRpc3RhbmNl