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给出一个数字x和n,请判断数字x是否是n位数
一行两个整数,x和n
如果是输出Yes,否则输出No
输入#1
123 3
输出#1
Yes
输入#2
23 1
输出#2
No
0<=x<=1000,1<=n<=40<=x<=1000,1<=n<=40<=x<=1000,1<=n<=4