Who Wants to be a Millionaire?

When you enter the "Who Wants to be a Millionaire? " competition, you are asked to write down a six-digit number $\overline { abcdef }$ . The winning number is also a six-digit number that looks like $\overline { uvwxyz }$ . If your six-digit number has at least 1 pair of consecutive digits that is exactly the same as a pair of consecutive digits from the winning number, then you are a winner! What is the least amount tickets you have to buy to ensure that you will win at least once?

*Note: $\overline { ab }$ = $\overline { uv }$ , $\overline { bc }$ = $\overline { vw }$ ... and $\overline { ef }$ = $\overline { yz }$ are valid

However, something like $\overline { ab }$ = $\overline {wx }$ or $\overline { ab }$ = $\overline { yz }$ are invalid