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#R, 117 91 bytes#
-16 bytes thanks to Giuseppe
a=scan();while(!a%in%c(1,4))a=sum((a%/%10^(0:nchar(a))%%10)^2);`if`(a-1,'unhappy','happy')
#R, 117117 91 bytes#
f=functiona=scan(a){while;while(!a%in%c(1,4))a=sum(as.numeric(el(strsplita%/%10^(as.character0:nchar(a),''))%%10)^2);`if`(a==1,'happy'a-1,'unhappy','happy')}
#R, 117 bytes#
f=function(a){while(!a%in%c(1,4))a=sum(as.numeric(el(strsplit(as.character(a),'')))^2);`if`(a==1,'happy','unhappy')}
