Kickdown

Time Limit: 2000MS

Memory Limit: 65536K

Description

A research laboratory of a world-leading automobile company has received an order to create a special transmission mechanism, which allows for incredibly efficient kickdown — an operation of switching to lower gear. After several months of research engineers found that the most efficient solution requires special gears with teeth and cavities placed non-uniformly. They calculated the optimal flanks of the gears. Now they want to perform some experiments to prove their findings.The first phase of the experiment is done with planar toothed sections, not round-shaped gears. A section of length n consists of n units. The unit is either a cavity of height h or a tooth of height 2h. Two sections are required for the experiment: one to emulate master gear (with teeth at the bottom) and one for the driven gear (with teeth at the top).

Input

There are two lines in the input file, each contains a string to describe a section. The first line describes master section (teeth at the bottom) and the second line describes driven section (teeth at the top). Each character in a string represents one section unit — 1 for a cavity and 2 for a tooth. The sections can not be flipped or rotated.Each string is non-empty and its length does not exceed 100.

Output

Write a single integer number to the output file — the minimal length of the stripe required to cut off given sections.

Sample Input

sample input #1
2112112112
2212112

sample input #2
12121212
21212121

sample input #3
2211221122
21212

Sample Output

sample output #1
10

sample output #2
8

sample output #3
15

Hint

Source

Northeastern Europe 2006

提交代码