Problems in getline()function...

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C++

in the loop for the first time before giving any input it autometically prints INVALID then it works corrctly where is the fault cann't understand help please....

What I have tried:

#include <iostream>
#include
using namespace std;

int main()
{
int n;
while(cin>>n)
{

for(int i=0;i<n;i++)>
{


string s;
getline(cin,s);

int len=s.size(),flag=0;
for(int i=1;i<100;i++)
{
int x=pow(i,2);

if(x==len)
{
flag=1;
break;

}

}
int len2=pow(len,.5);

if(flag==0)
cout<<"INVALID\n";

else
{
int p=0;

char c [len2][len2];
for(int i=0;i<len2;i++)>
{
for(int j=0;j<len2;j++)>
{
c[i][j]=s[p];
p++;

}
}

for(int j=0;j<4;j++)
{
for(int i=0;i<4;i=i+1)
{

cout<<c[i][j];

}

}
cout<<endl;



}

}

}

return 0;
}