from collections import deque

def fifo_queue(operations: list) -> list:
    # Simula una cola FIFO procesando las operaciones dadas
    queue = deque()
    for op in operations:
        if op.startswith("enqueue:"):
            queue.append(op.split(":")[1])
        elif op == "dequeue" and queue:
            queue.popleft()
    return list(queue)