key = input()
k = int(input())
words = []
for _ in range(k):
words.append(input())
for i in range(k):
for j in range(k):
if key in (words[i] + words[j]):
print('YES')
exit(0)
print('NO')
#include<bits/stdc++.h>
#define dbg printf("in\n");
#define nl printf("\n");
using namespace std;
int main()
{
// freopen("in.txt","r",stdin);
int i,j,k;
int n;
string p;
cin>>p>>n;
string s[n];
for(i=0;i<n;i++)
{
cin>>s[i];
if(s[i]==p)
{
cout<<"YES";
return 0;
}
}
k=1;
for(i=0;i<n;i++)
{
if(s[i][1]==p[0])
{
k=0;break;
}
}
if(k)
{
cout<<"NO";
return 0;
}
for(i=0;i<n;i++)
{
if(p[1]==s[i][0])
{
cout<<"YES";
return 0;
}
}
cout<<"NO";
return 0;
}
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