16A Flags

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#include<bits/stdc++.h>
#define ll long long
using namespace std;
int main()
{
ll i,j,n,m;
char s[101][101];
while(cin>>n>>m){
for(i=0;i<n;i++){
for(j=0;j<m;j++){
cin>>s[i][j];
}
}
bool f=1;
for(i=1;i<n;i++){
for(j=0;j<m;j++){
if(s[i][j]==s[i-1][j]){
f=0;
break;
}
}
}
for(i=0;i<n;i++){
for(j=1;j<m;j++){
if(s[i][j]!=s[i][j-1]){
f=0;
break;
}
}
}
if(f==1)
cout<<"YES\n";
else
cout<<"NO\n";
}
return 0;
}

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