Pizza or Broccoli

On each of the following $N$ days (numbered $1$ through $N$), Chef is planning to cook either pizza or broccoli. He wrote down a string $A$ with length $N$, where for each valid $i$, if the character $A_i$ is '1', then he will cook pizza on the $i$-th day, while if $A_i$ is '0', he will cook broccoli on this day. Chefu, his son, loves pizza but hates broccoli ― just like most kids. He wants to se