Lv.1_크기가 작은 부분문자열

https://school.programmers.co.kr/learn/courses/30/lessons/147355

프로그래머스

def solution(t, p):
    answer = 0    
    length = len(p)
    num = []
    
    for i in range(0, len(t)-length+1):
        num.append(t[i:i+length])
    
    for i in num:
        if i <= p:
            answer += 1
    return answer