After Xiao Ding passed his birthday in 1995, he found that his actual age at that time was the sum of the four numbers of his birth year, and how many years Xiao Ding was born.
小丁在他1995年过了生日后，发现他当时的实际年龄是他出生年份的四个数字之和，小丁是多少年出生的．
<result>1_974</result>