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Xiao K: Your mastery of A + B is already exceptional, but how would you handle it if I threw you a curveball with A - B?
Xiao C: ...Huh?
Xiao K: Naturally, my A - B isn't just any ordinary subtraction...
You are tasked with calculating the precise result of $A - B$ , where $A$ and $B$ are real numbers in $(0, 1)$ .

输入格式

Each input file contains one test case, which gives $A$ and $B$ , each in a line satisfying $0 \lt A\neq B \lt 1$ .
It is guaranteed that $A$ and $B$ have at most $10^5$ decimal places.

输出格式

Output the exact result of $A - B$ .
Note : Any missing digits after the decimal point are implicitly treated as zeros. For instance, $0.1$ should be taken as $0.1000000\dots$
The result should not contain any unnecessary trailing zeros. For instance, the result of $0.15 - 0.05$ should be $0.1$ , not $0.10$ .

题目示例数据

0.3289312903809158091238572881785912387582317578912375
0.483291480135890385123853120985901328501385091385319855890315890315903158903120958139085231980

-0.15436018975497457599999583280731008974315333349408235589031589031590315890312095813908523198