You are given a set of cards arranged in a line. Each card is either $\color{black}{\text{black}}$ or $\color{red}{\text{red}}$. You may divide the cards into two parts by picking a line before or after the whole cards (so that a part can contain 0 cards), or somewhere between two cards.

No matter how many cards are arranged in whatever manner, can you always ensure the number of $\color{black}{\text{black}}$ cards in the left part is exactly the same as the number of $\color{red}{\text{red}}$ cards in the right part?

An example split that fulfills the condition is shown below.

There is 1 $\color{black}{\text{black}}$ card in the left part and 1 $\color{red}{\text{red}}$ card in the right part