def checkDigit(char):
    digits=['1','2','3','4','5','6','7','8','9']
    for j in range(len(digits)):
        if char==digits[j]:
            return char
    return None

def checkYear(file):
    with open(file, "r", encoding="utf-8") as sampleCheck:
        line = 0
        lineCount = 0
        flag =0
        for row in sampleCheck:
            line += 1
            date = ''
            for char in row.lower():
                if char=='1':
                    flag = 1
                    date += char
                elif flag==1 and char=='9':
                    flag=2
                    date += char
                elif flag==2 and char==checkDigit(char):
                    flag=3
                    date += char
                elif flag==3 and char==checkDigit(char):
                    flag=4
                    date += char
                elif flag==4 and char==' ':
                    flag=5
                    date+=char
                elif flag==5 and char=='r':
                    flag=6
                    date+=char
                elif flag==6 and char=='.':
                    flag=7
                    date+=char
                if flag==7:
                    flag =0
                    date=''
                    print(line)
file = 'simple.in'
checkYear(file)