6105: ABC216——B - Same Name
[Creator : ]
Description
There are $N\ (2 \leq N \leq 1000)$ people. The family name and given name of the $i$-th person $(1 \leq i \leq N)$ are $S_i$ and $T_i$, respectively.
Determine whether there is a pair of people with the same family and given names. In other words, determine whether there is a pair of integers $(i,\ j)$ such that $1 \leq i \lt j \leq N,\ S_i=S_j,\ \text{and}\ T_i=T_j$.
Determine whether there is a pair of people with the same family and given names. In other words, determine whether there is a pair of integers $(i,\ j)$ such that $1 \leq i \lt j \leq N,\ S_i=S_j,\ \text{and}\ T_i=T_j$.
Input
Input is given from Standard Input in the following format:
$N\\
S_1\ T_1\\
S_2\ T_2\\
\hspace{0.6cm}\vdots\\
S_N\ T_N$
$N\\
S_1\ T_1\\
S_2\ T_2\\
\hspace{0.6cm}\vdots\\
S_N\ T_N$
Output
If there is a pair of people with the same family and given names, print Yes; otherwise, print No.
Sample 1 Input
3
tanaka taro
sato hanako
tanaka taro
Sample 1 Output
Yes
The first and third persons have the same family and given names.
Sample 2 Input
3
saito ichiro
saito jiro
saito saburo
Sample 2 Output
No
No two persons have the same family and given names.
Sample 3 Input
4
sypdgidop bkseq
bajsqz hh
ozjekw mcybmtt
qfeysvw dbo
Sample 3 Output
No